@article{1077477508,
author = {Helsel, R. G. and Levine, N.},
title = {Absolutely continuous product transformations of the plane},
journal = {Duke Math. J.},
volume = {19},
number = {1},
year = {1952},
pages = { 595-603},
language = {en},
url = {http://dml.mathdoc.fr/item/1077477508}
}
Helsel, R. G.; Levine, N. Absolutely continuous product transformations of the plane. Duke Math. J., Tome 19 (1952) no. 1, pp. 595-603. http://gdmltest.u-ga.fr/item/1077477508/