@INPROCEEDINGS {13541,
author={A. Gomes and F. Martins and H. Pinto and I.  Sebastião and . .},
doi={0},
booktitle={International Symp. Elementary Mathematics Teaching},
title={Improving teachers’ Mathematical and (Portuguese) Language Knowledge for Teaching using tasks: Portrayal of a project.},
year={2013},
month={August},
volume={1},
pages={-} 
}