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References
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| 1. |
Sh. A. Alimov, “Ob odnoi kraevoi zadache dlya ellipticheskogo operatora”, DAN, 253:2 (1980), 265–266    |
| 2. |
Yu. V. Egorov, V. A. Kondratev, “O zadache s kosoi proizvodnoi”, Matem. sb., 78:1 (1969), 148–176 |
| 3. |
B. Winzell, “Sub-elliptic estimates for the oblique derivative problem”, Math. Scand., 43:1 (1978), 169–176 |
| 4. |
F. Treves, “A new method of proof of the subelliptic estimates”, Comm. Pure Appl. Math., 24 (1971), 71–115  |
