Update README.md

README.md

@@ -16,6 +16,6 @@ The tests contain the query String representations of the involved query languag
 Currently the i2b2 tests are deactivated because they are not running.
 
 The transformations are described in the following papers:
-* i2b2<->AQL: https://www.ncbi.nlm.nih.gov/pubmed/30942705
+* i2b2<->AQL: [Query Translation Between openEHR and i2b2](http://www.is.informatik.uni-wuerzburg.de/staff/georgf/?tx_extbibsonomycsl_publicationlist%5BuserName%5D=georgfette&tx_extbibsonomycsl_publicationlist%5BintraHash%5D=ac22a483db2ade12285aa683e5c28a38&tx_extbibsonomycsl_publicationlist%5BfileName%5D=2019-EFMI-Query-Mapping_v2.pdf&tx_extbibsonomycsl_publicationlist%5Bcontroller%5D=Document&cHash=2a3b4d1b3d7ad85a400013927820089b)
 * AQL<->CQL: [Query Translation between AQL and CQL](http://www.is.informatik.uni-wuerzburg.de/staff/georgf/?tx_extbibsonomycsl_publicationlist%5BuserName%5D=georgfette&tx_extbibsonomycsl_publicationlist%5BintraHash%5D=38fc92ffbd2c809dc83e9b82e6641702&tx_extbibsonomycsl_publicationlist%5BfileName%5D=2019-MedInfo-Query-Translation-AQL-CQL_v2.pdf&tx_extbibsonomycsl_publicationlist%5Bcontroller%5D=Document&cHash=2f37a7efc2048c3ebd2cc5034dcf869c)
 * CQL<->Cypher: [Implementation of a HL7 CQL engine using the graph database Neo4J](http://www.is.informatik.uni-wuerzburg.de/staff/georgf/?tx_extbibsonomycsl_publicationlist%5BuserName%5D=georgfette&tx_extbibsonomycsl_publicationlist%5BintraHash%5D=146a6650045d35e5ef1c6e5fff0f05cb&tx_extbibsonomycsl_publicationlist%5BfileName%5D=2019-GMDS-FHIR-CQL-Neo4J_v2.pdf&tx_extbibsonomycsl_publicationlist%5Bcontroller%5D=Document&cHash=7121ec75a0133139e46e5d1c47a0181d)
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