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→Источники информации
* [https://math.dartmouth.edu/archive/m38s12/public_html/sources/Hall1935.pdf P. Hall, On representatives of subsets, Journal of the London Mathematical Society 10 (1935) pp. 26-30.]
* [https://cms.math.ca/openaccess/cjm/v10/cjm1958v10.0517-0534.pdf A. L. Dulmage and N. S. Mendelsohn: Coverings of bipartite graphs, Canad J. Math., (1958), 517-534.]
