1. Chartrand, G., Erwin, D., Harary, F., Zhang, P.: Radio labelings of graphs. Bull. Inst. Combin. Appl. 33, 77–85 (2001)
2. Chartrand, G., Erwin, D., Zhang, P: Radio antipodal colorings of cycles. In: Proceedings of the Thirty-first Southeastern International Conference on Combinatorics, Graph Theory and Computing, pp 129–141, Boca Raton FL 2000 (2000)
3. Das, S., Saha, L., Tiwary, K.: Antipodal radio labelling of full binary trees. In: Zhang, Z., Li, W., Du, D. Z. (eds.) AAIM 2020. LNCS. https://link.springer.com/book/10.1007/978-3-030-57602-8, vol. 12290, pp 456–4689. Springer, Heidelberg (2020)
4. Das, S., Ghosh, S.C., Nandi, S., Sen, S.: A lower bound technique for radio k-labelling. Discret. Math. 340(5), 855–861 (2017)
5. Hale, W.K.: Frequency assignment, theory and application. Proc. IEEE 68, 1497–1514 (1980)