Magnetoelastic studies of Nd0.75Dy0.25Fe3(BO3)4 in the external magnetic field: Magnetic phase transitions - G. A. Zvyagina; K. R. Zhekov; I. V. Bilych; A. A. Zvyagin; I. A. Gudim; V. L. Temerov; E. V. Eremin (Low Temperature Physics, 2013)