TY - JOUR AU - I. M. Gel'fand AU - Yu. I. Manin AU - M. A. Shubin TI - Poisson brackets and the kernel of the variational derivative in the formal calculus of variations JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 1976 SP - 30 EP - 34 VL - 10 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_1976_10_4_a2/ LA - ru ID - FAA_1976_10_4_a2 ER -