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LaPaugh, Andrea S.; Rivest, Ronald L., The subgraph homeomorphism problem, Journal of Computer and System Sciences, 1980, 20 (2): 133–149, MR 0574589, doi:10.1016/0022-0000(80)90057-4
K.Yuvarekha, V.Nandakumar, Dr.P.Sumathi. Characterization of Planar Graph with Edge Series. International Journal of Innovative Research in Science, Engineering and Technology (Department of Mathematics, Bharath University, Chennai, Tamil Nadu, India). 2014-12, 3 (12). ISSN 2319-8753. Homeomorphism of graph