Physical properties of liquid eutectic ionic systems NaF−LaF3 and NaF−NdF3 - L. A. Bulavin; A. A. Omelchuk; N. V. Faidyuk; V. M. Sklyarchuk; Yu. O. Plevachuk; V. S. Kopan; R. N. Savchuk (Ukrainian journal of physics, 2014)