Trillmich, F., Ono, K.A., Costa, D.P., DeLong, R.L., Feldkamp, S.D., Francis, J.M., Gentry, R.L., Heath, C.B., Le Boeuf, B.J., Majluf, P. & York, A.E. (1991). The effects of El Nino on pinniped populations in the eastern Pacific (Ecological studies ; 88). In F. Trillmich (Hrsg.), Pinnipeds and El Nino (S. 247-270). Berlin [u.a.]: Springer.