TY  - JOUR
AU  - S. P. Novikov
TI  - The~analytic generalized Hopf invariant. Many-valued functionals
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1984
SP  - 113
EP  - 124
VL  - 39
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1984_39_5_a5/
LA  - en
ID  - RM_1984_39_5_a5
ER  -