Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles - E. M. Alakshin; R. R. Gazizulin; A. M. Gazizulina; A. V. Klochkov; S. B. Orlinskii; A. A. Rodionov; T. R. Safin; K. R. Safiullin; M. S. Tagirov; Yu. Zakharov (Low Temperature Physics, 2015)