28 (3). pp. 497–520. doi:10.2307/1910129. Cite news Source title An automatic method of solving discrete programming problems Last name A. H. Land and A. G. Doig Year of publication 1960 Issue 3 Volume 28 Pages 497–520 DOI 10.2307/1910129 1 2 3 Clausen, Jens (1999).