@article{MT_1996_30_a3,
     author = {L. A. Bokut'},
     title = {Abstract semigroups and groups of formal series of dependent variables},
     journal = {Matemati\v{c}eskie trudy},
     pages = {70--88},
     publisher = {mathdoc},
     volume = {30},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1996_30_a3/}
}