Maryati T.K., Salman A.N.M., Baskoro E.T., Ryan J., and Miller M. “On H-Supermagic Labelings for Certain Shackles and Amalgamations of a Connected Graph”. Utilitas Mathematica, vol. 83, Sept. 2010, https://utilitasmathematica.com/index.php/Index/article/view/671.