William J. Collins. An extension to the external path length theorem. In Arthur M. Riehl, editor, Computer Trends in the 1990s - Proceedings of the 1989 ACM 17th Annual Computer Science Conference, Louisville, Kentucky, USA, February 21-23, 1989. pages 407, ACM, 1989. [doi]
@inproceedings{Collins89-0, title = {An extension to the external path length theorem}, author = {William J. Collins}, year = {1989}, doi = {10.1145/75427.1030228}, url = {http://doi.acm.org/10.1145/75427.1030228}, researchr = {https://researchr.org/publication/Collins89-0}, cites = {0}, citedby = {0}, pages = {407}, booktitle = {Computer Trends in the 1990s - Proceedings of the 1989 ACM 17th Annual Computer Science Conference, Louisville, Kentucky, USA, February 21-23, 1989}, editor = {Arthur M. Riehl}, publisher = {ACM}, isbn = {0-89791-299-3}, }