D.J. Collins
Bibliography
Boone, William W., Collins, D. J. and Matijasevič, Yu.V. 1971. “Embeddings into Semigroups with only a few Defining Relations.” in Proceedings of the 2nd Scandinavian Logic Symposion, edited by Jens Erik Fenstad, pp. 27–40. Studies in Logic and the Foundations of Mathematics n. 63. Amsterdam: North-Holland Publishing Co.