Dejan Plavsic Milan Soskic Zorislav Dakovic Ivan Gutman Ante Graovac Extension of the Z Matrix to Cycle-Containing and Edge-Weighted Molecular Graphs. 529-534 1997 37 Journal of Chemical Information and Computer Sciences 3 http://dx.doi.org/10.1021/ci960159o db/journals/jcisd/jcisd37.html#PlavsicSDGG97