TY - RPRT TI - Microstructural Characterization of Thin Polyimide Films by Positron Lifetime Spectroscopy AU - Eftekhari, A. AU - St.Clair, A. K. AU - Stoakley, D. M. AU - Sprinkle, Danny R. AU - Singh, J. J. PY - 1996 UR - https://ntrs.nasa.gov/citations/19970023099 ID - 19970023099 ER -