Advanced Program-to-Program Communication in SNA. - James P. Gray; Peter J. Hansen; Pete Homan; Michael A. Lerner; Mark Pozefsky (IBM Syst. J., 1983)

Search for useful graph theoretical invariants of molecular structure. - Milan Randic; Peter J. Hansen; Peter C. Jurs (J. Chem. Inf. Comput. Sci., 1988)