TY - JOUR AU - A. V. Balandin TI - On a zero curvature representation of a system of differential equations that is reducible to a nonlinear Klein–Gordon equation JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1994 SP - 15 EP - 16 IS - 2 UR - http://geodesic.mathdoc.fr/item/IVM_1994_2_a2/ LA - ru ID - IVM_1994_2_a2 ER -