[1] Bose Majumdar, N.C.: On some properties of sets with positive measure. Annali dell’ Universita di Ferrara X. N1, p1 (1962), 1–11.
[2] Ganguly, D.K. and Majumdar, M:
Some results on mid-point sets. Journal of Pure Mathematics 7 (1990), 27–33.
MR 1306645
[4] Ray, K.C.:
On some properties of ratio sets. Seminario mathematics del Universita di Ferrara, Sci VI (NS) (1962–65), 45–49.
MR 0188366