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@article{MM2_1996__90_2_156192, author = {Ignacio Sols and Luis Giraldo}, title = {On the sectional irregularity of congruences.}, journal = {Manuscripta mathematica}, pages = {239--266}, publisher = {mathdoc}, volume = {90}, number = {2}, year = {1996}, zbl = {0898.14016}, url = {http://geodesic.mathdoc.fr/item/MM2_1996__90_2_156192/} }
Ignacio Sols; Luis Giraldo. On the sectional irregularity of congruences.. Manuscripta mathematica, Tome 90 (1996) no. 2, pp. 239-266. http://geodesic.mathdoc.fr/item/MM2_1996__90_2_156192/