@article{IM2_2004_68_5_a2,
     author = {S. M. Dudakov},
     title = {The collapse theorem for theories of $I$-reducible algebraic systems},
     journal = {Izvestiya. Mathematics},
     pages = {911--933},
     year = {2004},
     volume = {68},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2004_68_5_a2/}
}