1. Thanks Evans!;Anderson;Proc. London Math. Soc.,1983
2. On a conjecture of Häggkvist on partial Latin squares;Denley,2001
3. Completing some partial Latin squares;Denley;Europ. J. Combinatorics,1995
4. T. Denley, Kuhl, S. Jaromy, Completing partial Latin squares: a conjecture of Häggkvist, in: Proceedings of the Thirty-fifth Southeastern International Conference on Combinatorics, Graph Theory and Computing, Congr. Numer. (2004) 123–128.
5. Embedding incomplete Latin squares;Evans;Amer. Math. Monthly,1960