@article{CMFD_2010_36_a7,
     author = {V. I. Korzyuk and O. A. Konopel'ko and E. S. Cheb},
     title = {Boundary-value problems for fourth-order equations of hyperbolic and composite types},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {87--111},
     publisher = {mathdoc},
     volume = {36},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2010_36_a7/}
}