@article{SM_1989_64_2_a0,
     author = {O. N. Ageev},
     title = {Dynamical systems with an even-mulriplicity {Lebesgue} component in the spectrum},
     journal = {Sbornik. Mathematics},
     pages = {305--317},
     publisher = {mathdoc},
     volume = {64},
     number = {2},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1989_64_2_a0/}
}