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2. English translation in Funct. Anal. Appl. 9 (1975), 183-185.
3. [2] W. D. Brownawell, “On the orders of zero of certain functions” in Abelian Functions and Transcendental Numbers (Palaiseau, 1979), Mém. Soc. Math. Fr. (N.S.) 2 (1980/81), 5–20.
4. [3] W. D. Brownawell, “Zero estimates for solutions of differential equations” in Diophantine Approximations and Transcendental Numbers (Luminy, 1982), Progr. Math. 31, Birkhäuser, Boston, 1983, 67–94.
5. [4] W. D. Brownawell and D. W. Masser, Multiplicity estimates for analytic functions, I, J. Reine Angew. Math. 314 (1980), 200–216.