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- [6] NONZERO SOLUTIONS OF BOUNDARY-VALUE PROBLEMS FOR SECOND-ORDER ORDINARY AND DELAY-DIFFERENTIAL EQUATIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1972, 19 (02): : A390 - A390
- [7] 2-POINT BOUNDARY-VALUE PROBLEMS FOR SYSTEMS OF SECOND-ORDER ORDINARY DIFFERENTIAL EQUATIONS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1973, 7 (AUG): : 55 - 63