Geodesic
Inequivalent Regular Factors of Regular Graphs on 8 Vertices
Publications de l'Institut Mathématique, _N_S_29 (1981) no. 43, p. 171 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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In this paper we shall find all nonisomorphic factorizations of all regular graphs on 8 vertices into two regular factors without the use of a computer (as a contrast to [1]). These factorizations are significant since they produce regular graphs with the least eigenvalue $-2$ which are neither line-graphs nor cocktail-party graphs but which are cospectral to line-graphs (cf [1]). 
@article{PIM_1981_N_S_29_43_a19,
     author = {Zoran S. Radosavljevi\'c},
     title = {Inequivalent {Regular} {Factors} of {Regular} {Graphs} on 8 {Vertices}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {171 },
     year = {1981},
     volume = {_N_S_29},
     number = {43},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1981_N_S_29_43_a19/}
}
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Zoran S. Radosavljević. Inequivalent Regular Factors of Regular Graphs on 8 Vertices. Publications de l'Institut Mathématique, _N_S_29 (1981) no. 43, p. 171 . http://geodesic.mathdoc.fr/item/PIM_1981_N_S_29_43_a19/