@article{700801,
     title = {On completions of convergence commutative 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 = {1972},
     pages = {335-340},
     mrnumber = {MR0365451},
     zbl = {0309.22004},
     url = {http://dml.mathdoc.fr/item/700801}
}

Novák, J. On completions of convergence commutative groups, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1972), pp. 335-340. http://gdmltest.u-ga.fr/item/700801/