@article{GDZPPN002237873, title = {On the sectional irregularity of congruences.}, journal = {Manuscripta mathematica}, volume = {91}, year = {1996}, pages = {239-266}, zbl = {0898.14016}, url = {http://dml.mathdoc.fr/item/GDZPPN002237873} }
Sols, Ignacio; Giraldo, Luis. On the sectional irregularity of congruences.. Manuscripta mathematica, Tome 91 (1996) pp. 239-266. http://gdmltest.u-ga.fr/item/GDZPPN002237873/