Köppen, Manfred ; Lang, Michael ; Helfrich, Reiner ; Steglich, Frank ; Thalmeier, P. ; Schmidt, B. ; Wand, B. ; Pankert, D. ; Benner, Hartmut (1999):
Solitary magnetic excitations in the low-carrier density, one-dimensional S=1/2 antiferromagnet Yb4As3.
82, In: Physical review letters, p. 4548. [Article]

Köppen, Manfred ; Pankert, D. ; Hauptmann, ; Lang, Michael ; Weiden, ; Geibel, Christoph ; Steglich, Frank (1998):
Interference of a first-order transition with the formation of a spin-Peierls state in alpha'-NaV2O5.
In: Physical review. B 57 (1998), S. 8466, [Article]