W. E. Cossum

Mechanical manipulation of chemical structure: Molform computation and substructure searching of organic structures by the use of cipherdirected, extended and random matrices

Michael F. Lynch, Howard Lee Morgan, G. M. Dyson, 1963, Inf. Storage Retr..

Advances in Automatic Chemical Substructure Searching Techniques.

W. E. Cossum, M. F. Lynch, M. L. Krakiwsky, 1965 .