TY - JOUR AU - L. A. Pastur AU - V. A. Tkachenko TI - Spectral theory of Schr\"odinger operators with periodic complex-valued potentials JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 1988 SP - 85 EP - 86 VL - 22 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_1988_22_2_a19/ LA - ru ID - FAA_1988_22_2_a19 ER -