@article{AL_2007_46_6_a3,
     author = {I. Sh. Kalimullin},
     title = {Spectra of degrees of some structures},
     journal = {Algebra i logika},
     pages = {729--744},
     publisher = {mathdoc},
     volume = {46},
     number = {6},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2007_46_6_a3/}
}