@inbook {5424, title = {Phylogeny reconstruction and molecular dating in four Neotropical genera of Annonaceae: the effect of taxon sampling in age estimation}, booktitle = {Plant species-level systematics: new perspectives on pattern and process}, year = {2005}, pages = {149-174}, publisher = {Gantner Verlag}, organization = {Gantner Verlag}, address = {Ruggell}, author = {Pirie, M. D. and Chatrou, L. W. and Erkens, R. H. J. and Maas, J. W. and Van der Niet, T. and Mols, J. and Richardson, J. E.}, editor = {Bakker, F. T. and Chatrou, L. W. and Gravendeel, B. and Pelser, P.B.} } @article {5059, title = {Classification of a large and widespread genus of Neotropical trees, Guatteria (Annonaceae) and its three satellite genera Guatteriella, Guatteriopsis and Heteropetalum}, journal = {TaxonTaxon}, volume = {56}, number = {3}, year = {2007}, month = {Aug}, pages = {757-774}, isbn = {0040-0262}, author = {Erkens, R. H. J. and Chatrou, L. W. and Koek-Noorrnan, J. and Maas, J. W. and Maas, P. J. M.} }