@article{CRMATH_2018__356_6_586_0,
     author = {Medina, Juan Miguel and Klotz, Lutz Peter and Riedel, Manfred},
     title = {Density of spaces of trigonometric polynomials with frequencies from a subgroup in {\protect\emph{L}\protect\textsuperscript{\protect\emph{\ensuremath{\alpha}}}-spaces}},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {586--593},
     publisher = {Elsevier},
     volume = {356},
     number = {6},
     year = {2018},
     doi = {10.1016/j.crma.2018.04.021},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2018.04.021/}
}