Annales Polonici Mathematici > 1999 > 72 > 1 > 1-14
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journal ISSN : | 0066-2216 |
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[1] J. H. Barrett, Oscillation theory of ordinary linear differential equations, Adv. Math. 3 (1969), 415-509, and Lectures on Differential Equations, R. McKelvey (ed.), Academic Press, New York, 1970.
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[2] G. J. Butler and L. H. Erbe, Oscillation results for second order differential systems, SIAM J. Math. Anal. 17 (1986), 19-29.
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[3] G. J. Butler, L. H. Erbe and A. B. Mingareli, Riccati techniques and variational principles in oscillation theory for linear systems, Trans. Amer. Math. Soc. 503 (1987), 263-282.