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@article{Authenticus:P-004-NHA,
	title = {{Normal forms for two classes of exact Poisson structures in dimension four}},
	author = {I Cruz and H Mena Matos},
	doi = {10.1112/s0024610705022532},
	journal = {Journal of the London Mathematical Society-second Series},
	number = {1},
	pages = {194-208},
	publisher = {London Math Soc},
	type = {Article},
	volume = {73},
	year = {2006}
}