Lo, Y. H. (2010). 邊著色圖中的混色子圖 [doctoral dissertation, National Chiao Tung University]. Airiti Library. https://doi.org/10.6842/NCTU.2010.00506
Ng, H. W. (2010). Counter-majoritarian difficulty? [master's thesis, The University of Hong Kong]. Airiti Library. https://www.airitilibrary.com/Article/Detail?DocID=U0029-1812201200018300
MURALI, V., & MAKAMBA, B. B. (2003). ON AN EQUIVALENCE OF FUZZY SUBGROUPS III. International Journal of Mathematics and Mathematical Sciences, 2003(), 2303-2313-174. https://doi.org/10.1155/S0161171203205238