[BETS]2 complex and BETS salts with square-planar platinate (II), nickelate (II) anions: (BETS)4Pt(CN)4, (BETS)4Ni(CN)4 N. Spitsina, A. Dubrovskii, L. Buravov, G. Shilov, O. Dyachenko, Y. Okano and A. Kobayashi J. Phys. IV France, 114 (2004) 577-579 DOI: 10.1051/jp4:2004114137