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Литература
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| 1. |
Ritt G.F., Trans. Amer. Math. Soc., 31 (1929), 680–686    |
| 2. |
Shields A., Comm. Pure Appl. Math., XVI (1963), 27–31  |
| 3. |
Гордон A.Я., Лeвин Б.Я., Функц. анализ, 5:1 (1971), 22–29  |
| 4. |
Avanissian V., Gay R., Bull. Soc. math. France, 103 (1975), 341–384 |
| 5. |
Berenstein C.A., Dostal M.A., Ark. för mat., 12:2 (1974), 267–280  |
| 6. |
Selberg H., Avh. Noske Vid. Akad. Oslo, 1/10 (1931), 1–8 |
