@article{10_4153_CJM_1974_101_6,
     author = {Zanten, A. J. van and Vries, E. de},
     title = {On {The} {Number} of {Classes} of a {Finite} {Group} {Invariant} for {Certain} {Substitutions}},
     journal = {Canadian journal of mathematics},
     pages = {1090--1097},
     year = {1974},
     volume = {26},
     number = {5},
     doi = {10.4153/CJM-1974-101-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-101-6/}
}