@article{AL_1984_23_5_a1,
     author = {N. Ya. Medvedev},
     title = {Free products of $l$-groups},
     journal = {Algebra i logika},
     pages = {493--511},
     publisher = {mathdoc},
     volume = {23},
     number = {5},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1984_23_5_a1/}
}