Geodesic
On the sum of squares of vector fields
Differencialʹnye uravneniâ, Tome 33 (1997) no. 11, pp. 1516-1522.

Voir la notice de l'article provenant de la source Math-Net.Ru

@article{DE_1997_33_11_a10,
     author = {N. N. Petrov},
     title = {On the sum of squares of vector fields},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1516--1522},
     publisher = {mathdoc},
     volume = {33},
     number = {11},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_11_a10/}
}
TY  - JOUR
AU  - N. N. Petrov
TI  - On the sum of squares of vector fields
JO  - Differencialʹnye uravneniâ
PY  - 1997
SP  - 1516
EP  - 1522
VL  - 33
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1997_33_11_a10/
LA  - ru
ID  - DE_1997_33_11_a10
ER  - 
%0 Journal Article
%A N. N. Petrov
%T On the sum of squares of vector fields
%J Differencialʹnye uravneniâ
%D 1997
%P 1516-1522
%V 33
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1997_33_11_a10/
%G ru
%F DE_1997_33_11_a10
N. N. Petrov. On the sum of squares of vector fields. Differencialʹnye uravneniâ, Tome 33 (1997) no. 11, pp. 1516-1522. http://geodesic.mathdoc.fr/item/DE_1997_33_11_a10/