@article{GDZPPN002068095, title = {A balanced proper modification of P3.}, journal = {Commentarii mathematici Helvetici}, volume = {66}, year = {1991}, pages = {505-511}, zbl = {0761.53034}, url = {http://dml.mathdoc.fr/item/GDZPPN002068095} }
Alessandrini, L.; Bassanelli, G. A balanced proper modification of P3.. Commentarii mathematici Helvetici, Tome 66 (1991) pp. 505-511. http://gdmltest.u-ga.fr/item/GDZPPN002068095/