@article{1195515922,
author = {Yamaguchi, Keizo},
title = {On involutive systems of second order of codimension $2$},
journal = {Proc. Japan Acad. Ser. A Math. Sci.},
volume = {58},
number = {5},
year = {1982},
pages = { 302-305},
language = {en},
url = {http://dml.mathdoc.fr/item/1195515922}
}
Yamaguchi, Keizo. On involutive systems of second order of codimension $2$. Proc. Japan Acad. Ser. A Math. Sci., Tome 58 (1982) no. 5, pp. 302-305. http://gdmltest.u-ga.fr/item/1195515922/