Geodesic
On the Permanent of a Certain Class of (0, 1)-Matrices
Canadian mathematical bulletin, Tome 14 (1971) no. 4, pp. 507-511

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In [3, p. 77] Ryser notes the importance of the minimum of the permanent function on the class of (0, 1)-matrices having exactly k ones in each row and column. In [4] a lower bound was found for the minimum of the permanent on the class Λn of n × n (0, 1)-matrices with exactly three l's in each row and column. The purpose of our work is to improve this result, in particular we show that minA ∊ Λn (per A) ≥ 3(n-1). 
Hartfiel, D. J.; Crosby, J. W. On the Permanent of a Certain Class of (0, 1)-Matrices. Canadian mathematical bulletin, Tome 14 (1971) no. 4, pp. 507-511. doi: 10.4153/CMB-1971-091-1
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     title = {On the {Permanent} of a {Certain} {Class} of (0, {1)-Matrices}},
     journal = {Canadian mathematical bulletin},
     pages = {507--511},
     year = {1971},
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