Akihito Kaneko: Rare earth metal-nickel hydrogen storage alloy, process for producing the same, and anode for nickel-hydrogen rechargeable battery. Santoku Metal, Darby & Darby, November 24, 1998: US05840166 (24 worldwide citation)

A rare earth metal-nickel hydrogen storage alloy having a composition represented by the formula (1) (R.sub.1-x L.sub.x) (Ni.sub.1-y M.sub.y).sub.z . . . (1) (R: La, Ce, Pr, Nd; L: Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc, Mg, Ca; M: Co, Al, Mn, Fe, Cu, Zr, Ti, Mo, Si, V, Cr, Nb, Hf, Ta, W, B, C; 0.05. ...