@article{AA_1991_3_3_a4,
     author = {A. I. Kostrikin and Pham Huu Tiep},
     title = {Classification of irreducible orthogonal decompositions of simple {Lie} algebras of type $A_n$},
     journal = {Algebra i analiz},
     pages = {86--109},
     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1991_3_3_a4/}
}