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- [1] DIFFERENTIAL INEQUALITIES + EXTENSION OF LYAPUNOVS METHOD PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY, 1964, 60 (04): : 891 - &
- [5] DIFFERENTIAL EQUATIONS IN BANACH SPACES AND EXTENSION OF LYAPUNOVS METHOD PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY, 1963, 59 (02): : 373 - &
- [6] INTEGRO-DIFFERENTIAL EQUATIONS AND EXTENSION OF LYAPUNOVS METHOD NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1969, 16 (01): : 186 - &
- [7] DIFFERENTIAL-SYSTEMS WITH IMPULSIVE PERTURBATIONS AND AN EXTENSION OF LYAPUNOVS METHOD INDIAN JOURNAL OF PURE & APPLIED MATHEMATICS, 1982, 13 (08): : 890 - 897
- [10] EXTENSION OF METHOD OF SECTORS FOR STUDYING LYAPUNOVS INSTABILITY ANNALES DE LA SOCIETE SCIENTIFIQUE DE BRUXELLES SERIES 1-SCIENCES MATHEMATIQUES ASTRONOMIQUES ET PHYSIQUES, 1973, 87 (01): : 17 - 49