P. I. Petrov, “Invariants and classification of differential quadratic forms in four variables”, Izv. Akad. Nauk SSSR Ser. Mat., 1959, Volume 23, Issue 3,Pages <nobr>387

JOURNALS // Izvestiya Rossiiskoi Akademii Nauk. Seriya Matematicheskaya // Archive

Izv. Akad. Nauk SSSR Ser. Mat., 1959 Volume 23, Issue 3, Pages 387–420 (Mi im3750)

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Invariants and classification of differential quadratic forms in four variables

P. I. Petrov

Received: 19.02.1958

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