@article{JCGS.864, title={U-Pb zircon and monazite geochronology of Variscan magmatism related to syn-convergence extension in central northern Portugal} author={Azevedo and Valle Aguado and Schaltegger and Nolan and Medina and Martins}, journal={Journal of the Czech Geological Society}, volume={48}, number={1-2}, pages={16--0}, year=2003, publisher={Czech Geological Society} }