Results and evaluation of a survey to estimate Pacific walrus population size, 2006 - Speckman, Suzann; Chernook, Vladimir; Burn, Douglas M.; Udevitz, Mark; Kochnev, Anatoly; Vasilev, Alexander; Jay, Chadwick; Lisovsky, Alexander; Fischbach, Anthony; Benter, R. Bradley (Marine Mammal Science, 2011)