Magnetic properties of the low dimensional spin system (VO)2P2O7: ESR and susceptibility A. V. Prokofiev, F. Büllesfeld, W. Assmus, H. Schwenk, D. Wichert, U. Löw and B. Lüthi Eur. Phys. J. B, 5 3 (1998) 313-316 Published online: 15 October 1998 DOI: 10.1007/s100510050448