1. J. Hoffmann-Jørgensen, ?Measures which agree on balls,? Math. Scand.,37, No. 2, 319?326 (1975).
2. J. P. R. Christensen, ?A survey of small ball theorems and problems,? Lecture Notes in Math., No. 794, 24?30 (1980).
3. H. Federer, Geometric Measure Theory, Springer, New York (1969).
4. D. Preiss, ?Dimension of metrics and differentiation of measures,? in: General Topology and Its Relations to Modern Analysis and Algebra, V (Prague, 1981), Heldermann, Berlin (1983), pp. 565?568.
5. N. A. Sapogov, ?On a uniqueness problem for finite measures in Euclidean spaces, ? Zap. Nauchn. Sem. Leningr. Otd. Mat. Inst.,41, 3?13(1974).