@article{10_4153_CMB_2016_011_2,
     author = {Chen, Chung-Chuan},
     title = {Recurrence of {Cosine} {Operator} {Functions} on {Groups}},
     journal = {Canadian mathematical bulletin},
     pages = {693--704},
     year = {2016},
     volume = {59},
     number = {4},
     doi = {10.4153/CMB-2016-011-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2016-011-2/}
}