Mutembei, J., W. Kamaku, and B. Kivunge. “ Two and Three Arcs”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 24, no. 3, Sept. 2015, pp. 112-21, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4486.