Petrov, P. I. Second order invariants of the quaternary differential quadratic form. (Russian) Zbl 0079.38102 Dokl. Akad. Nauk SSSR 113, 1214-1217 (1957); correction ibid. 119, 846 (1958). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Review Keywords:Riemannian Manifolds; Connections PDF BibTeX XML Cite \textit{P. I. Petrov}, Dokl. Akad. Nauk SSSR 113, 1214--1217 (1957; Zbl 0079.38102) OpenURL