• [1] A. H. Clifford, A system arising from a weakened set of group postulates, Ann. of Math. (2) 34 (1933), 865-871. MR 1503137
• [2] H. B. Mann, On certain systems which are almost groups, Bull. Amer. Math. Soc. 50 (1944), 879-881. MR 0011313 (6:147g)
• [3] K. Shoda, General theory of algebra, Tokyo, Kyoritsusha, 1947 (Japanese). MR 0037827 (12:313e)
• [4] R. H. Bruck, A survey of binary systems, Springer-Verlag, Berlin, 1958. MR 0093552 (20:76)
• [5] T. Tamura, R. B. Merkel and J. F. Latimer, Note on the direct product of certain groupoids, Proc. Japan Acad. 37 (1961), 482-484. MR 0137781 (25:1230)

Bibliography

[1]

A. H. Clifford, A system arising from a weakened set of group postulates, Ann. of Math. (2) 34 (1933), 865-871. MR 1503137

[2]

H. B. Mann, On certain systems which are almost groups, Bull. Amer. Math. Soc. 50 (1944), 879-881. MR 0011313 (6:147g)

[3]

K. Shoda, General theory of algebra, Tokyo, Kyoritsusha, 1947 (Japanese). MR 0037827 (12:313e)

[4]

R. H. Bruck, A survey of binary systems, Springer-Verlag, Berlin, 1958. MR 0093552 (20:76)

[5]

T. Tamura, R. B. Merkel and J. F. Latimer, Note on the direct product of certain groupoids, Proc. Japan Acad. 37 (1961), 482-484. MR 0137781 (25:1230)