[1] T. Neubrunn, T. Šalát:
Distance sets, ratio sets and certain transformations of sets of real numbers. Čas. Pěst. Mat. 94 (1969), 381–393.
MR 0257309
[2] M. Pal:
On certain transformations of Sets in $R_N$. Acta F.R.N. Univ. Comen. Mathematica XXIX, 1974, pp. 43–58.
MR 0377024 |
Zbl 0291.28014
[4] N.G. Saha, K.C. Ray:
On sets under certain transformations in $R_N$. Publ. Inst. Math. 22(36) (1977), 237–244.
MR 0486381
[5] R.L. Wheeden, A. Zygmund:
Measure and Integration. Marcel Dekker, Inc., New York, 1977, pp. 45.
MR 0492146