@article{SM_1974_22_3_a6,
     author = {I. S. Gudovich},
     title = {On the method of orthogonal extension of overdetermined systems},
     journal = {Sbornik. Mathematics},
     pages = {456--464},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1974_22_3_a6/}
}