SHIFT OF THE ANGULAR SPEED OF COLLECTIVIZATION OF VORTEX OSCILLATIONS IN ROTATING HELIUM II UNDER HIGH PRESSURE Z.Sh. Nadirashvili and J.S. Tsakadze J. Phys. Colloques, 39 C6 (1978) C6-182-C6-183 DOI: 10.1051/jphyscol:1978681