Hegde, S.M.Kumudakshi2020-03-312020-03-312016Electronic Notes in Discrete Mathematics, 2016, Vol.53, , pp.149-154https://idr.nitk.ac.in/handle/123456789/11373In this paper we present the gracefulness of the directed graph Pm?Pn? which is an orientation of the planar grid graph Pm?Pn, in which each cell is a unicycle of length four. 2016 Elsevier B.V.Article