Preface

P. Eloe, University of Dayton, Dayton, Ohio, U.S.A.
J. Henderson, Baylor University, Waco, Texas, U.S.A.

E. J. Qualitative Theory of Diff. Equ., Spec. Ed. I, 2009 No. 0., pp. 1-3.

Abstract: This special issue honours the career of John Graef on the occasion of his sixty-seventh birthday.

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