@article{pinto_britto_bunchaft_pascoal_rosa_2003,  title={Casimir effect for a massive scalar field under mixed boundary conditions},  volume={33},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332003000400042},  DOI={10.1590/S0103-97332003000400042},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Pinto, A.C. Aguiar and Britto, T.M. and Bunchaft, R. and Pascoal, F. and Rosa, F.S.S. da},  year={2003},  month={Dec},  pages={860–866} }