When some elementary free volumes in polymers are not seen by positron annihilation experiments.

Authors: V P Shantarovich, V G Bekeshev, A V Pastukhov, V A Davankov, O K Krasil'nikova, E V Belousova, I B Kevdina, M K Filimonov, V W Gustov

Source: Journal of Physics: Conference Series; 6/11/2015, Vol. 618 Issue 1, p1-1, 1p