Estimating the abundance of marine mammal populations
Hammond, P.S., TB. Francis, D. Heinemann, K.J. Long, J.E. Moore, A.E. Punt, M. Siple, R.R. Reeves, M. Sepúlveda, G. Már Sigurosson, M.C. Siple, G. Vikingsson, P.R. Wade, R. Williams & A.N. Zerbini