1. G. Natta:Atti Acc. Naz. Lincei, Memorie,4 (8), 61 (1955);G. Natta andP. Corradini:Atti Acc. Naz. Lincei,4 (8), 73 (1955);G. Natta:Journ. Pol. Science,16, 143 (1955);G. Natta, P. Pino, P. Corradini, F. Danusso, E. Mantica, G. Mazzanti andG. Moraglio:Journ. Am. Chem. Soc.,77, 1708 (1955).
2. See for instance:A. Todd:Perspectives in organic chemistry (New York, 1956), p. 68.
3. G. Natta:Atti Acc. Naz. Lincei, Memorie,4 (8), 61 (1955).
4. G. Natta andP. Corradini:Journ. Pol. Science,20, 251 (1956).
5. G. Natta andP. Corradini:Rend. Acc. Naz. Lincei,19 (8), 229 (1955);G. Natta, P. Corradini andL. Porri:Rend. Acc. Naz. Lincei,20 (8), 728 (1956);G. Natta andP. Corradini:Angew. Chemie,68, 615 (1956);G. Natta, P. Corradini andI. W. Bassi:Rend. Acc. Naz. Lincei,23 (8), 363 (1957).