Geodesic
Second order invariants of the quaternary differential quadratic form
Doklady Akademii Nauk, Tome 113 (1957) no. 6, pp. 1214-1217 Cet article a éte moissonné depuis la source Math-Net.Ru

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@article{DAN_1957_113_6_a6,
     author = {P. I. Petrov},
     title = {Second order invariants of the quaternary differential quadratic form},
     journal = {Doklady Akademii Nauk},
     pages = {1214--1217},
     year = {1957},
     volume = {113},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_6_a6/}
}
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P. I. Petrov. Second order invariants of the quaternary differential quadratic form. Doklady Akademii Nauk, Tome 113 (1957) no. 6, pp. 1214-1217. http://geodesic.mathdoc.fr/item/DAN_1957_113_6_a6/