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@article{CMH_1991__66_4_140244, author = {L. Alessandrini and G. Bassanelli}, title = {A balanced proper modification of {P3.}}, journal = {Commentarii mathematici Helvetici}, pages = {505--511}, publisher = {mathdoc}, volume = {66}, number = {4}, year = {1991}, zbl = {0761.53034}, url = {http://geodesic.mathdoc.fr/item/CMH_1991__66_4_140244/} }
L. Alessandrini; G. Bassanelli. A balanced proper modification of P3.. Commentarii mathematici Helvetici, Tome 66 (1991) no. 4, pp. 505-511. http://geodesic.mathdoc.fr/item/CMH_1991__66_4_140244/