@article {Sarsfield_Cabral, title = {Partitioning the grapevine growing season in the Douro Valley of Portugal: Accumulated heat better than calendar dates}, journal = {International Journal of Biometeorology}, volume = {59}, year = {2015}, pages = {1045-1059}, issn = {0020-7128}, doi = {10.1007/s00484-014-0918-1}, url = {http://doi.org/10.1007/s00484-014-0918-1}, author = {Jos{\'e} Ant{\'o}nio Sarsfield Cabral and AC Real and J Borges and GV Jones} }