Kowalski, A., M. Florczak, J. Libiszowski, K. Majerska, and A. Duda. “Application of the 27Al NMR Spectroscopy to Studies of Mechanisms of Cyclic Esters Polymerization”. Polimery, vol. 52, no. 10, Aug. 2022, pp. 722-9, http://ichp.vot.pl/index.php/p/article/view/1466.