TY - JOUR AU - Zh. I. Abdullaev TI - Essential Schr\"odinger operator spectrum of one system of four particles on a lattice JO - Teoretičeskaâ i matematičeskaâ fizika PY - 2000 SP - 81 EP - 87 VL - 123 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_2000_123_1_a6/ LA - ru ID - TMF_2000_123_1_a6 ER -