The aim of this article is to answer a question posed by J. Oprea in his talk at the Workshop "Homotopy and Geometry".
@article{bwmeta1.element.bwnjournal-article-bcpv45i1p91bwm,
author = {Hattori, Akio},
title = {4-dimensional c-symplectic $S^1$-manifolds with non-empty fixed point set need not be c-Hamiltonian},
journal = {Banach Center Publications},
volume = {43},
year = {1998},
pages = {91-93},
zbl = {0994.57032},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-bcpv45i1p91bwm}
}
Hattori, Akio. 4-dimensional c-symplectic $S^1$-manifolds with non-empty fixed point set need not be c-Hamiltonian. Banach Center Publications, Tome 43 (1998) pp. 91-93. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-bcpv45i1p91bwm/
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