@article{10_37236_4238,
     author = {Istv\'an Est\'elyi and Istv\'an Kov\'acs},
     title = {On groups all of whose undirected {Cayley} graphs of bounded valency are integral},
     journal = {The electronic journal of combinatorics},
     year = {2014},
     volume = {21},
     number = {4},
     doi = {10.37236/4238},
     zbl = {1305.05100},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/4238/}
}