A SURVEY OF THE GRACEFULNESS OF DIGRAPHS
Feng Wei, Chunlei Xu, Jirimutu · International Journal of Pure and Apllied Mathematics · 2011
Graph labeling traces its origin to the famous conjecture that all trees are graceful presented by A.Rosa in 1966. In recent years, many research papers on graceful graph have been published. In this survey we have collected studies on the gracefulness of the directed circuit ~ Cm and the union graph of