code: public static CitationIDIndexPair fromJson(List<?> arr) {
  		String citationId = (String)arr.get(0);
  		int noteIndex = ((Number)arr.get(1)).intValue();
  		return new CitationIDIndexPair(citationId, noteIndex);
  	}
docs: Converts a JSON array to a CitationIDIndexPair object.
  @param arr the JSON array to convert
  @return the converted CitationIDIndexPair object