CohortIQ: An Integrative Bio-specimen Discovery and Annotation Portal. - Philip R. O. Payne; Arka Pattanayak; Shubhanan Deshpande; David Ervin (AMIA, 2012)

Ontolograph: A Hybrid Ontology and Graph Database Designed for High-Dimensional Phenomic and Genomic Data Integration. - Arka Pattanayak; James Chen (AMIA, 2013)