Structure, composition and magnetocaloric properties in polycrystalline La 1-x A x MnO 3+8 (A = Na, K) W. Zhong, W. Chen, W. P. Ding, N. Zhang, A. Hu, Y. W. Du and Q. J. Yan Eur. Phys. J. B, 3 2 (1998) 169-174 Published online: 15 May 1998 DOI: 10.1007/s100510050298