SUBSTITUTED POLYACETYLENES BY CYCLOPOLYMERIZATION : POLY (1, 6-HEPTADIYNE) AND POLY (PROPIOLIC ANHYDRIDE) H.W. Gibson, A.J. Epstein, H. Rommelmann, D.B. Tanner, Xiao-Quing Yang et J.M. Pochan J. Phys. Colloques, 44 C3 (1983) C3-651-C3-656 DOI: 10.1051/jphyscol:19833128