Introduction to the Kalman filter

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      "bibcite_publisher" => Drupal\Core\Field\BaseFieldDefinition {#2639}
      "bibcite_place_published" => Drupal\Core\Field\BaseFieldDefinition {#2642}
      "bibcite_issn" => Drupal\Core\Field\BaseFieldDefinition {#2645}
      "bibcite_isbn" => Drupal\Core\Field\BaseFieldDefinition {#2648}
      "bibcite_accession_number" => Drupal\Core\Field\BaseFieldDefinition {#2651}
      "bibcite_call_number" => Drupal\Core\Field\BaseFieldDefinition {#2654}
      "bibcite_other_number" => Drupal\Core\Field\BaseFieldDefinition {#2657}
      "bibcite_citekey" => Drupal\Core\Field\BaseFieldDefinition {#2660}
      "bibcite_url" => Drupal\Core\Field\BaseFieldDefinition {#2663}
      "bibcite_doi" => Drupal\Core\Field\BaseFieldDefinition {#2666}
      "bibcite_research_notes" => Drupal\Core\Field\BaseFieldDefinition {#2669}
      "bibcite_tertiary_title" => Drupal\Core\Field\BaseFieldDefinition {#2672}
      "bibcite_short_title" => Drupal\Core\Field\BaseFieldDefinition {#2675}
      "bibcite_alternate_title" => Drupal\Core\Field\BaseFieldDefinition {#2678}
      "bibcite_translated_title" => Drupal\Core\Field\BaseFieldDefinition {#2681}
      "bibcite_original_publication" => Drupal\Core\Field\BaseFieldDefinition {#2684}
      "bibcite_other_author_affiliations" => Drupal\Core\Field\BaseFieldDefinition {#2687}
      "bibcite_remote_db_name" => Drupal\Core\Field\BaseFieldDefinition {#2690}
      "bibcite_remote_db_provider" => Drupal\Core\Field\BaseFieldDefinition {#2693}
      "bibcite_label" => Drupal\Core\Field\BaseFieldDefinition {#2696}
      "bibcite_access_date" => Drupal\Core\Field\BaseFieldDefinition {#2699}
      "bibcite_refereed" => Drupal\Core\Field\BaseFieldDefinition {#2702}
      "bibcite_pmid" => Drupal\Core\Field\BaseFieldDefinition {#2705}
      "created" => Drupal\Core\Field\BaseFieldDefinition {#2708}
      "changed" => Drupal\Core\Field\BaseFieldDefinition {#2712}
      "revision_default" => Drupal\Core\Field\BaseFieldDefinition {#2716}
      "moderation_state" => Drupal\Core\Field\BaseFieldDefinition {#2734}
      "metatag" => Drupal\Core\Field\BaseFieldDefinition {#2726}
      "path" => Drupal\Core\Field\BaseFieldDefinition {#2730}
      "field_body" => Drupal\field\Entity\FieldConfig {#2738}
      "field_cover_media" => Drupal\field\Entity\FieldConfig {#2739}
      "field_ecmwf_image" => Drupal\field\Entity\FieldConfig {#2740}
      "field_exclude_from_search" => Drupal\field\Entity\FieldConfig {#2741}
      "field_media_publication_file" => Drupal\field\Entity\FieldConfig {#2742}
      "field_mint_doi" => Drupal\field\Entity\FieldConfig {#2743}
      "field_publication_file" => Drupal\field\Entity\FieldConfig {#2744}
      "field_real_date" => Drupal\field\Entity\FieldConfig {#2745}
      "field_web_version" => Drupal\field\Entity\FieldConfig {#2746}
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        #name: "English"
        #id: "en"
        #direction: "ltr"
        #weight: 0
        #locked: false
      }
      "und" => Drupal\Core\Language\Language {#1681
        #name: "Not specified"
        #id: "und"
        #direction: "ltr"
        #weight: 2
        #locked: true
      }
      "zxx" => Drupal\Core\Language\Language {#77
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        #id: "zxx"
        #direction: "ltr"
        #weight: 3
        #locked: true
      }
    ]
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    #defaultLangcode: "en"
    #translations: array:1 [
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        "status" => 1
        "entity" => Drupal\bibcite_entity\Entity\Reference {#2366}
      ]
    ]
    #translationInitialize: false
    #newRevision: false
    #isDefaultRevision: "1"
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      "published" => "1"
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    #validationRequired: false
    #loadedRevisionId: "10273"
    #revisionTranslationAffectedKey: "revision_translation_affected"
    #enforceRevisionTranslationAffected: []
    #isSyncing: false
    +inPreview: null
  }
  "#items" => Drupal\Core\Field\EntityReferenceFieldItemList {#2421}
  "#formatter" => "bibcite_contributor_label"
  "#is_multiple" => true
  "#third_party_settings" => []
  0 => array:5 [
    "#type" => "link"
    "#title" => "R.N. Miller"
    "#url" => Drupal\Core\Url {#3290
      #urlGenerator: null
      #urlAssembler: null
      #accessManager: null
      #routeName: "entity.bibcite_contributor.canonical"
      #routeParameters: array:1 [
        "bibcite_contributor" => "43021"
      ]
      #options: array:3 [
        "entity_type" => "bibcite_contributor"
        "entity" => Drupal\bibcite_entity\Entity\Contributor {#3166
          #entityTypeId: "bibcite_contributor"
          #enforceIsNew: null
          #typedData: Drupal\Core\Entity\Plugin\DataType\EntityAdapter {#3126 …8}
          #cacheContexts: []
          #cacheTags: []
          #cacheMaxAge: -1
          #_serviceIds: []
          #_entityStorages: []
          #values: array:13 [ …13]
          #fields: array:8 [ …8]
          #fieldDefinitions: array:15 [ …15]
          #languages: array:3 [ …3]
          #langcodeKey: "langcode"
          #defaultLangcodeKey: "default_langcode"
          #activeLangcode: "x-default"
          #defaultLangcode: "en"
          #translations: array:1 [ …1]
          #translationInitialize: false
          #newRevision: false
          #isDefaultRevision: true
          #entityKeys: array:5 [ …5]
          #translatableEntityKeys: array:1 [ …1]
          #validated: false
          #validationRequired: false
          #loadedRevisionId: null
          #revisionTranslationAffectedKey: "revision_translation_affected"
          #enforceRevisionTranslationAffected: []
          #isSyncing: false
        }
        "language" => Drupal\Core\Language\Language {#1679}
      ]
      #external: false
      #unrouted: false
      #uri: null
      #internalPath: null
      #_serviceIds: []
      #_entityStorages: []
    }
    "#options" => array:3 [
      "entity_type" => "bibcite_contributor"
      "entity" => Drupal\bibcite_entity\Entity\Contributor {#3166}
      "language" => Drupal\Core\Language\Language {#1679}
    ]
    "#cache" => array:3 [
      "tags" => array:1 [
        0 => "bibcite_contributor:43021"
      ]
      "contexts" => array:1 [
        0 => "user.permissions"
      ]
      "max-age" => -1
    ]
  ]
  "#cache" => array:3 [
    "contexts" => []
    "tags" => []
    "max-age" => -1
  ]
  "#weight" => 5
]