1. J. BOLLE, Chem. Ind. 83 (1960) 249.
2. A. F. CHILDS, H. COATES, J. Oil Colour Chem. Assoc., 42 (1959) 612.
3. M. G. CHURCH, Trans. J. Plastics Inst., 24 (1956) 235.
4. G. QUESNEL, Chem. Ind., 83 (1960) 257.
5. J. REMOND, Rev. Prod. Chim., 60 (1957) 195.