@article{700624,
     title = {Two-sided nonsingular transformations},
     booktitle = {General topology and its relations to modern analysis and algebra IV},
     series = {GDML\_Books},
     publisher = {Society of Czechoslovak Mathematicians and Physicist},
     address = {Praha},
     year = {1977},
     pages = {179-186},
     mrnumber = {MR0473139},
     zbl = {0368.28023},
     url = {http://dml.mathdoc.fr/item/700624}
}

Iwanik, A. Two-sided nonsingular transformations, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. 179-186. http://gdmltest.u-ga.fr/item/700624/