Spontaneous vocal differentiation of coo-calls for tools and food in Japanese monkeys 論文 Sayaka Hihara・Hiroko Yamada・Atsushi Iriki・Kazuo Okanoya ·2003-03-25 ·『Neuroscience Research』 45(4) pp. 383-389 doi:10.1016/s0168-0102(03)00011-7