@article{RM_2013_68_4_a5,
     author = {D. Sh. Devadze and V. Sh. Beridze},
     title = {Optimality conditions for quasi-linear differential equations with non-local boundary conditions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {773--775},
     publisher = {mathdoc},
     volume = {68},
     number = {4},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2013_68_4_a5/}
}