@article{TMF_2005_142_2_a9,
     author = {N. J. MacKay},
     title = {Boundary integrability of nonlinear sigma models},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {322--328},
     publisher = {mathdoc},
     volume = {142},
     number = {2},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2005_142_2_a9/}
}