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Differentsial'nye Uravneniya, 1997, Volume 33, Number 11, Pages 1516–1522 (Mi de9586)  
Ordinary Differential Equations

On the sum of squares of vector fields

N. N. Petrov

Saint Petersburg State University
Full-text PDF (1570 kB)
Received: 25.04.1995
Bibliographic databases:
Document Type: Article
UDC: 517.97
Language: Russian
Citation: N. N. Petrov, “On the sum of squares of vector fields”, Differ. Uravn., 33:11 (1997), 1516–1522; Differ. Equ., 33:11 (1997), 1522–1527
Citation in format AMSBIB
\Bibitem{Pet97}
\by N.~N.~Petrov
\paper On the sum of squares of vector fields
\jour Differ. Uravn.
\yr 1997
\vol 33
\issue 11
\pages 1516--1522
\mathnet{http://mi.mathnet.ru/de9586}
\mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=1668389}
\transl
\jour Differ. Equ.
\yr 1997
\vol 33
\issue 11
\pages 1522--1527
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