@article{JRAM_1989__393_153097,
     author = {Enrique Arrondo and Igancio Sols},
     title = {Classification of smooth congruences of low degree.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {199--219},
     publisher = {mathdoc},
     volume = {393},
     year = {1989},
     zbl = {0649.14027},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__393_153097/}
}