Frank Harary, Robert W. Robinson. Isomorphic factorizations X: Unsolved problems. Journal of Graph Theory, 9(1):67-86, 1985. [doi]
@article{HararyR85,
title = {Isomorphic factorizations X: Unsolved problems},
author = {Frank Harary and Robert W. Robinson},
year = {1985},
doi = {10.1002/jgt.3190090105},
url = {http://dx.doi.org/10.1002/jgt.3190090105},
researchr = {https://researchr.org/publication/HararyR85},
cites = {0},
citedby = {0},
journal = {Journal of Graph Theory},
volume = {9},
number = {1},
pages = {67-86},
}