Ku, T. H. (2007). Embedded Triangular Graphs [master's thesis, National Chi Nan University]. Airiti Library. https://doi.org/10.6837/NCNU.2007.00221
Shen, Y. J., & Tolosa, J. (2008). The Weighted Fermat Triangle Problem. International Journal of Mathematics and Mathematical Sciences, 2008(), 165-180. https://doi.org/10.1155/2008/283846