@article{UFA_2015_7_4_a4,
     author = {N. P. Girya and S. Yu. Favorov},
     title = {Various definitions of the spectrum of almost periodic functions},
     journal = {Ufa mathematical journal},
     pages = {58--70},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2015_7_4_a4/}
}