Li, P. (2006). Novel quantum magnetic states in low dimensions [doctoral dissertation, The University of Hong Kong]. Airiti Library. https://www.airitilibrary.com/Article/Detail?DocID=U0029-1812201200014229
Dias, N. C., & Prata, J. N. (2010). A Global, Dynamical Formulation of Quantum Confined Systems. Proceedings of the Estonian Academy of Sciences, 59(4), 290-293. https://www.airitilibrary.com/Article/Detail?DocID=17367530-201012-201012070008-201012070008-290-293