NEW PHENOMENA RELATED TO PROPAGATION OF WAVE PROCESSES IN He–II FLOW B.N. Eselson, N.E. Dyumin, V.G. Ivantsov and R.I. Shcherbachenko J. Phys. Colloques, 39 C6 (1978) C6-224-C6-225 DOI: 10.1051/jphyscol:1978699