TY - JOUR AU - V. S. Rabinovich TI - Essential Spectrum of Schr\"odinger Operators on Periodic Graphs JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 2018 SP - 80 EP - 84 VL - 52 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_2018_52_1_a9/ LA - ru ID - FAA_2018_52_1_a9 ER -