References

ON THE POINTS AT DIFFERENT DISTANCES FROM ALL LATTICE POINTS


[1] I. J. Schoenberg, Mathematical time exposures, The Mathematical Association of America, 1982.

[2] I. J. Schoenberg, On a problem of Steinhaus on lattice points, Amer. Math. Monthly 86 (1979), 765-766.

[3] W. Sierpiński, A selection of problems in the theory of numbers, Translated from Polish by A. Sharma, Macmillan, New York, 1964.