Geodesic
On the question of the involutivity of systems of Pfaffian equations
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1980), pp. 39-44 
G. N. Makeev. On the question of the involutivity of systems of Pfaffian equations. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1980), pp. 39-44. http://geodesic.mathdoc.fr/item/IVM_1980_1_a6/
@article{IVM_1980_1_a6,
     author = {G. N. Makeev},
     title = {On the question of the involutivity of systems of {Pfaffian} equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {39--44},
     year = {1980},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1980_1_a6/}
}
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