@article{IM2_1979_13_3_a7,
     author = {N. I. Nagnibida},
     title = {On roots of the multiple integration operator in the space of functions analytic in a~disk},
     journal = {Izvestiya. Mathematics },
     pages = {685--693},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1979_13_3_a7/}
}