1. Sroog CE (1969) Encyclopedia of Polymer Science and Technology 11, John Wiley and Sons Inc, NY, p 247
2. Startsev VM, Tukaev VN, Ogarev VA (1977) Plastmassy, USSR, 3:9
3. Frenkel SYa, Kolesov VI (1976) Vysokomolek soed, USSR, 18A, 8:1680; see also Serchenkova SV, Shablyghyn MV, Kravchenko TV, Bogdanov MV, Kudryavtsev GI (1976) Vysokomolek soed, USSR, 18A, 8:1863
4. Theocaris PS, (1981) (ed) Sih GC, Experimental Determination of Crack-Tip Stress Intensity Factors, Mechanics of Fracture 7, M. Nijhoff Publ, Holland, p 189
5. Theocaris PS (1971) Applied Optics 10:2240