D. Burago et B. Kleiner, SEPARATED NETS IN EUCLIDEAN-SPACE AND JACOBIANS OF BILIPSCHITZ MAPS, Geometric and functional analysis, 8(2), 1998, pp. 273-282
We show that there are separated nets in the Euclidean plane which are
not biLipschitz equivalent to the integer lattice. The argument is ba
sed on the construction of a continuous function which is not the Jaco
bian of a biLipschitz map.