TY  - JOUR
AU  - Yu. G. Borisovich
AU  - B. M. Darinskii
AU  - O. V. Kunakovskaya
TI  - Application of topological methods to estimate the number of longitudinal elastic waves in crystals
JO  - Teoretičeskaâ i matematičeskaâ fizika
PY  - 1993
SP  - 146
EP  - 152
VL  - 94
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TMF_1993_94_1_a10/
LA  - ru
ID  - TMF_1993_94_1_a10
ER  -