Diagonalization of the neutralino mass matrix and boson–neutralino interaction V.A. Beylin, V.I. Kuksa, R.S. Pasechnik and G.M. Vereshkov Eur. Phys. J. C, 56 3 (2008) 395-405 Published online: 17 July 2008 DOI: 10.1140/epjc/s10052-008-0660-0