ON NONLINEAR STAGE OF PARAMETRIC INSTABILITIES OF WAVES EXCITED BY LOCALIZED PUMPING S.M. Musher, B.D. Ochirov and A.M. Rubenchik J. Phys. Colloques, 40 C7 (1979) C7-649-C7-650 DOI: 10.1051/jphyscol:19797315