Geodesic
On the normal solvability and index of first-order systems of composite type
Doklady Akademii Nauk, Tome 235 (1977) no. 4, pp. 753-756 
A. Dzhuraev; È. Muhamadiev. On the normal solvability and index of first-order systems of composite type. Doklady Akademii Nauk, Tome 235 (1977) no. 4, pp. 753-756. http://geodesic.mathdoc.fr/item/DAN_1977_235_4_a6/
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     author = {A. Dzhuraev and \`E. Muhamadiev},
     title = {On the normal solvability and index of first-order systems of composite type},
     journal = {Doklady Akademii Nauk},
     pages = {753--756},
     year = {1977},
     volume = {235},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_235_4_a6/}
}
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