Returns the the citations to papers identified by a single DOI (literal) and the RDF types of the citing objects (assays and activities).

Query: 
SELECT ?object ?type WHERE { ?paper <http://purl.org/ontology/bibo/doi> "10.1016/0960-894X(94)00449-P" . ?object ?cites ?paper . ?object <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?type . }
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