George R. T. Hendry C. J. Knickerbocker Patti Frazer Lock Michael Sheard Forbidden subgraphs of graphs uniquely Hamiltonian-connected from a vertex. 281-290 1998 187 Discrete Mathematics 1-3 http://dx.doi.org/10.1016/S0012-365X(97)00220-3 db/journals/dm/dm187.html#HendryKLS98