@article{01727489,
title = {Engel structures with trivial characteristic foliations.},
journal = {Geometry \& Topology},
volume = {6},
year = {2002},
pages = {239-255},
doi = {10.2140/agt.2002.2.239},
zbl = {1008.53061},
language = {en},
url = {http://dml.mathdoc.fr/item/01727489}
}
Adachi, Jiro. Engel structures with trivial characteristic foliations.. Geometry & Topology, Tome 6 (2002) pp. 239-255. doi : 10.2140/agt.2002.2.239. http://gdmltest.u-ga.fr/item/01727489/