VORSTER, O. The use of parallel plate rheology to determine the intrinsic viscosity of polyethylene terephthalate. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;, v. 24, n. 4, p. 134-138, 23 set. 2005.