On Siegel three folds with a projective Calabi--Yau model
  In two recent papers, we described some Siegel modular threefolds which admit a weak Calabi--Yau model. Not all of them admit a {\it projective} model. The purpose of this paper is to exhibit criterions for the projectivity, to treat several examples, and to compute their Hodge numbers. 
Eberhard Freitag, Riccardo Salvati Manni
math.AG