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Khukhunashvili, Z. Z.; Khukhunashvili, V. Z.: Addendum to alternative analysis generated by a differential equation. Electronic journal of qualitative theory of differential equations 7. p. 1. (2004)
Khukhunashvili, Z. Z.; Khukhunashvili, V. Z.: Alternative analysis generated by a differential equation. Electronic journal of qualitative theory of differential equations 2. pp. 1-31. (2003)