@incollection{CIF_1993__S24__57_0,
     author = {Kaliman, S. and Makar-Limanov, L.},
     title = {On {Some} {Family} of {Contractible} {Hypersurfaces} in $C^4$},
     booktitle = {S\'eminaire d'alg\`ebre et g\'eom\'etrie, journ\'ees singuli\`eres et jacobiennes},
     editor = {Gonzalez-Sprinberg, G. and Lejeune-Jalabert, M. and Spivakovsky, M. and Zaidenberg, M. G.},
     series = {Cours de l'institut Fourier},
     pages = {57--75},
     publisher = {Institut des Math\'ematiques Pures - Universit\'e Scientifique et M\'edicale de Grenoble},
     number = {S24},
     year = {1993},
     url = {http://archive.numdam.org/item/CIF_1993__S24__57_0/}
}