Geodesic
Study of generalized translation conditions for a~class of surfaces of positive curvature
Matematičeskie zametki, Tome 18 (1975) no. 1, pp. 115-121.

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Infinitesimal deformations of surfaces of positive curvature which satisfy a strong umbilicity condition at some point are studied under a generalized translation boundary condition. Families of vector fields are isolated among which there can exist not more than a countable set of characteristic vector fields with the generalized translation condition. 
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     author = {V. V. Kazak},
     title = {Study of generalized translation conditions for a~class of surfaces of positive curvature},
     journal = {Matemati\v{c}eskie zametki},
     pages = {115--121},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_1_a14/}
}
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V. V. Kazak. Study of generalized translation conditions for a~class of surfaces of positive curvature. Matematičeskie zametki, Tome 18 (1975) no. 1, pp. 115-121. http://geodesic.mathdoc.fr/item/MZM_1975_18_1_a14/