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On limit-point and separation criteria for linear differential expressions. (English) Zbl 0329.34020
Proc. Equadiff III, 3rd Czech. Conf. Differ. Equat. Appl., Brno 1972, 31-42 (1973).
34B20 Weyl theory and its generalizations for ordinary differential equations
34A30 Linear ordinary differential equations and systems
35P05 General topics in linear spectral theory for PDEs
47E05 General theory of ordinary differential operators
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