@ARTICLE {7428,
author={C. Vicente and P.S André and R. A. Sá Ferreira},
doi={10.1590/S1806-11172012000300012},
journal={Revista Brasileira de Ensino de Física},
title={Simple measurement of surface free energy using a web cam},
year={2012},
month={November},
volume={34},
number={3},
pages={3312-1-3312-5},
ISSN={}
}