Geodesic
A Remark on a Theorem of M. Hall
Canadian mathematical bulletin, Tome 17 (1974) no. 4, pp. 547-548

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Let A = (aij) be an m×n (0, 1)-matrix, m≤n. The permanent of A is defined by where the summation is over all one-one functions σ:{1, 2, . . . , m}→{1, 2, . . . , n}. If A is regarded as the incidence matrix of a configuration of m subsets of an n-set, then Per (A) is the number of systems of distinct representatives in the configuration. 
Minc, Henryk. A Remark on a Theorem of M. Hall. Canadian mathematical bulletin, Tome 17 (1974) no. 4, pp. 547-548. doi: 10.4153/CMB-1974-096-4
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     author = {Minc, Henryk},
     title = {A {Remark} on a {Theorem} of {M.} {Hall}},
     journal = {Canadian mathematical bulletin},
     pages = {547--548},
     year = {1974},
     volume = {17},
     number = {4},
     doi = {10.4153/CMB-1974-096-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-096-4/}
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