Chang, T. H. (2012). 在有限區間向量型Sturm-Liouville方程式的唯一性定理 [doctoral dissertation, Tamkang University]. Airiti Library. https://doi.org/10.6846/TKU.2012.00133
HAGGARD, P. W. (1988). SOME APPLICATIONS OF LEGENDRE NUMBERS. International Journal of Mathematics and Mathematical Sciences, 1988(), 405-412. https://doi.org/10.1155/S0161171288000481