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Free volume studies in polycaprolactone/poli(propylene oxide) urethane/urea membranes by positron lifetime and Doppler spectroscopy

Authors: M.F. Ferreira Marques, P.M. Gordo, A.P. de Lima, D.P. Queiroz, M. Norberta de Pinho, P. Major, Zs. Kajcsos

Ref.: Acta Physica Polonica A 113 (2008)