[1] HARTNELL B. L.: Some problems on spanning trees. Proc. Fifth Manitoba Conf. Numer. Math., 1975, 375-384. MR 0409248

[2] ORE O.: Theory of Graphs. Amer. Math. Soc. Colloq. Publ. XXXVIII, Providence 1962. MR 0150753 | Zbl 0105.35401

[3] ZELINKA B.: Medians and peripherians of trees. Arch. Math. Brno 4, 1968, 87-95. MR 0269541 | Zbl 0206.26105

[4] ZELINKA B.: Grafy, jejichž všechny kostry jsou spolu isomorfní. (Graphs, all of whose spanning trees are isomorphic to each other.) Čas. Pěst. Mat., 96, 1971, 33-40. MR 0286711