1. Buttrey, D.J., Honig, J.M.: Synthesis, structure, and properties of La2NiO4+δ in: Chemistry of high temperature superconductors, Rao, C.N.R. (ed.), World Scientific, Singapore (1992) 283.
2. Sigmund, E., Muller, K.A. (eds.): Proc. Second Int. Workshop Phase Separation in Cuprate Superconductors, 1993, Cottbus, Germany; Springer, Berlin (1994). XVII, 401.
3. Henggeler, W., Furrer, A.: J. Phys. Condens. Matter 10 (1998) 2579.
4. Furrer, A., Mesot, J., Henggeler, W., Bottger, G.: J. Supercond. 10 (1997) 273.
5. Kimball C.W., Dabrowski, B., Liang, Y., Peng, W., Dunlap, B.D.: Hyperfine Interact. 72 (1992) 153.