@article{DE_2006_42_2_a1,
     author = {S. R. Baslandze and I. T. Kiguradze},
     title = {On the unique solvability of a periodic boundary value problem for third-order linear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {153--158},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_2_a1/}
}