Low-dimensional magnetism of spin-½ chain systems α- and β-TeVO4: a comparative study - V. Gnezdilov; P. Lemmens; D. Wulferding; Yu. Pashkevich; K. Lamonova; K.-Y. Choi; O. Afanasiev; S. Gnatchenko; H. Berger (Low Temperature Physics, 2012)