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- [1] POLY(P-PHENYLENE TEREPHTHALAMIDE) FILMS FORMED FROM EXTRUSION AND COAGULATION OF LIQUID-CRYSTALLINE SULFURIC-ACID-SOLUTIONS - CHARACTERIZATION OF ORIENTATION AND VOID STRUCTURE, ANNEALING, AND UPGRADING OF FILM MECHANICAL-PROPERTIES POLYMER ENGINEERING AND SCIENCE, 1984, 24 (04): : 242 - 251