TY - JOUR AU - A. Yu. Anikin AU - M. A. Vavilova TI - Semiclassical asymptotic behavior of the lower spectral bands of the Schrödinger operator with a trigonal-symmetric periodic potential JO - Teoretičeskaâ i matematičeskaâ fizika PY - 2020 SP - 264 EP - 277 VL - 202 IS - 2 UR - http://geodesic.mathdoc.fr/item/TMF_2020_202_2_a5/ LA - ru ID - TMF_2020_202_2_a5 ER -