Geodesic
Selfadjoint matrix operators eigenvalues estimations
Fundamentalʹnaâ i prikladnaâ matematika, Tome 3 (1997) no. 1, pp. 15-36.

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In this paper selfadjoint matrix operators in coupling continuums small oscillations problems are considered. Influence of coupling to a structure of a discretic spectrum of the operator is studied. The received results are applied to one problem about rotated liquid small oscillations with a free border. 
@article{FPM_1997_3_1_a1,
     author = {A. Fragella Collar},
     title = {Selfadjoint matrix operators eigenvalues estimations},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {15--36},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1997_3_1_a1/}
}
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A. Fragella Collar. Selfadjoint matrix operators eigenvalues estimations. Fundamentalʹnaâ i prikladnaâ matematika, Tome 3 (1997) no. 1, pp. 15-36. http://geodesic.mathdoc.fr/item/FPM_1997_3_1_a1/