On condition of Jacobi positivity of second variation
Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta, Mathematics. Vol. III, Tome 146 (1950) no. 146, pp. 116-125

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     author = {L. Tclaf},
     title = {On condition of {Jacobi} positivity of second variation},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {116--125},
     publisher = {mathdoc},
     volume = {146},
     number = {146},
     year = {1950},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1950_146_146_a4/}
}
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L. Tclaf. On condition of Jacobi positivity of second variation. Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta, Mathematics. Vol. III, Tome 146 (1950) no. 146, pp. 116-125. http://geodesic.mathdoc.fr/item/UZMU_1950_146_146_a4/