Auriemma, F., Born, R., Spiess, H. W., De Rosa, C., & Corradini, P. (1995). SOLID-STATE C-13-NMR INVESTIGATION OF THE DISORDER IN CRYSTALLINE SYNDIOTACTIC POLYPROPYLENE. Macromolecules, 28(20), 6902-6910. doi:10.1021/ma00124a028.