Maximum Common Substructures of Organic Compounds Exhibiting Similar Infrared Spectra. - Kurt Varmuza; Plamen N. Penchev; Heinz Scsibrany (J. Chem. Inf. Comput. Sci., 1998)

Characteristic Substructures in Sets of Organic Compounds with Similar Infrared Spectra. - Plamen N. Penchev; Kurt Varmuza (Comput. Chem., 2001)

INFERCNMR: A 13C NMR Interpretive Library Search System. - Plamen N. Penchev; Klaus-Peter Schulz; Morton E. Munk (J. Chem. Inf. Model., 2012)