@article{JMAG_2005_12_2_a1,
     author = {S. G. Veliev},
     title = {Bases from eigenfunctions subsets of two discontinuous differential operators},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {148--157},
     year = {2005},
     volume = {12},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2005_12_2_a1/}
}