@article{IM2_2014_78_6_a2,
     author = {P. A. Borodin},
     title = {Density of a~semigroup in {a~Banach} space},
     journal = {Izvestiya. Mathematics },
     pages = {1079--1104},
     publisher = {mathdoc},
     volume = {78},
     number = {6},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2014_78_6_a2/}
}