Magnetic interaction in Mg, Ti, Nb doped manganites I. O. Troyanchuk, M. V. Bushinsky, H. Szymczak, K. Bärner and A. Maignan Eur. Phys. J. B, 28 1 (2002) 75-80 Published online: 09 July 2002 DOI: 10.1140/epjb/e2002-00202-2