(1)
I.N. Adamenko, K.E. Nemchenko, V.A. Slipko, and A.F.G. Wyatt, The unusual properties of anisotropic systems of quasiparticles in superfluid 4He, Low Temp. Phys. 33, (2007) [Fiz. Nizk. Temp. 33, 1008-1015, (2007)] DOI: https://doi.org/10.1063/1.2780172.