@article{AA_2013_25_2_a10,
     author = {R. G. Shterenberg and V. V. Sukhanov},
     title = {Scattering for differential operators of order four on the {half-line.~I.} {Direct} problem},
     journal = {Algebra i analiz},
     pages = {236--250},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2013_25_2_a10/}
}