E. Rodney Canfield Catherine S. Greenhill Brendan D. McKay Asymptotic enumeration of dense 0-1 matrices with specified line sums. 32-66 2008 115 J. Comb. Theory, Ser. A 1 http://dx.doi.org/10.1016/j.jcta.2007.03.009 db/journals/jct/jcta115.html#CanfieldGM08