@article{700833,
     title = {Two classes of almost periodic functions on topological $T\_0$-groups},
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1967},
     pages = {63-67},
     zbl = {0169.46902},
     url = {http://dml.mathdoc.fr/item/700833}
}

Boseck, H. Two classes of almost periodic functions on topological $T_0$-groups, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1967), pp. 63-67. http://gdmltest.u-ga.fr/item/700833/