1. 1) Shell International Resea., Brit. P. 10, 50,679 (Dec. 7, 1966)
2. 2) F. X. Ventrice : Modern Plastics, 54 [1], 201 (1967)
3. 3) P. F. Bruins : “Epoxy Resin Technology” Interscience Pub. p.77 (1968)
4. 6) D. Warren, U. S. P. 3,356,645 (1967)
5. 8) K. Wagner : Angew. Chem. internat. Edt., 9 [1], 50 (1970)