@article{CLTM_1966_1966_1_a3,
     author = {Kamthan, P. K.},
     title = {On continuity of circle operation in normed algebras.},
     journal = {Collectanea mathematica},
     publisher = {mathdoc},
     year = {1966},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1966_1966_1_a3/}
}