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Stow
(2021)
Valence and oscillation of functions in the unit diskANNALES ACADEMIAE SCIENTIARUM FENNICAE. MATHEMATICA
(SUOMALAINEN TIEDEAKATEMIA, 2016)
OSCILLATION OF SOLUTIONS OF LINEAR DIFFERENTIAL EQUATIONS
(CAMBRIDGE UNIV PRESS, 2009)
In this note we study the zeros of solutions of differential equations of the form u '' + pu = 0. A criterion for oscillation is found, and some sharper forms of the Sturm comparison theorem are given.