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- [2] ON LIMIT-POINT CLASSIFICATION OF SECOND-ORDER DIFFERENTIAL OPERATORS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY, 1966, 41 (163P): : 531 - &
- [3] WEIGHTED DIFFERENTIAL OPERATORS IN LIMIT-POINT CASE - PRELIMINARY REPORT NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1971, 18 (01): : 163 - &
- [6] SECONDARY CONDITIONS FOR LINEAR DIFFERENTIAL OPERATORS OF THE 2ND ORDER JOURNAL OF MATHEMATICS AND MECHANICS, 1957, 6 (02): : 247 - 285
- [10] INTERVAL LIMIT-POINT CRITERIA FOR DIFFERENTIAL EXPRESSIONS AND THEIR POWERS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1977, 15 (JAN): : 119 - 133