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- [8] ON A 4TH ORDER SYMMETRIC DIFFERENTIAL-EQUATION QUARTERLY JOURNAL OF MATHEMATICS, 1982, 33 (129): : 97 - 113
- [10] BOUNDEDNESS THEOREM FOR A CERTAIN FOURTH ORDER DIFFERENTIAL EQUATION JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1972, 5 (AUG): : 376 - &