%0 Journal Article %T On the Excitation Energy in Liquid Helium II %A Kebukawa, Takeji %A Yamasaki, Shuichiro %A Sunakawa, Sigenobu %A , %J Progress of Theoretical Physics %@ 0033-068X %D 1970-09-01 %I Oxford University Press (OUP) %~ DeepDyve