@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/