@article{MM2_1977__22_251737,
     author = {Ralf Kern},
     title = {On {Multiply} {Periodic} {Real} {Functions:} {An} {Addendum.}},
     journal = {Manuscripta mathematica},
     pages = {289--292},
     publisher = {mathdoc},
     volume = {22},
     year = {1977},
     zbl = {0392.26004},
     url = {http://geodesic.mathdoc.fr/item/MM2_1977__22_251737/}
}