1. L. A. Bassalygo, Applied Algebra, Algebraic Algorithms and Error-Correcting Codes, Proceedings of the 11th International Symposium, Paris, July, 1995, Cohen, G.Giusti, M. T. 1995, Springer, 1, 3
2. Theory and Applications of Distance Geometry;Blumenthal,1953
3. Coincidence theorems in 2-metric spaces;Cho;SEA Bull, Math.,1996
4. J. Diatta, 1996, 177
5. On ternary operations and semigroups;Dillahunty;J. Undergraduate Math.,1997