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2. Aparecido, J. B.; Cotta, R. M. (1987): Fully developed laminar flow in trapezoidal ducts. Proc. of the 9th Brazilian Congress of Mech. Eng., COBEM 87, V.I, pp. 25?28
3. Cotta, R. M. (1986): Steady-state diffusion with space-dependent boundary condition parameters. Proc. of the First National Meeting on Thermal Sciences?ENCIT-86, pp. 163?166, Rio de Janeiro, Brazil, December
4. Cotta, R. M. (1986): Diffusion in media with prescribed moving boundaries:?Application to metals oxidation at high temperatures. II Latin American Congress of Heat & Mass Transfer, V.1, pp. 502?513, São Paulo, Brazil
5. Cotta R. M.; Özisik M. N. (1987): Diffusion problems with general time-dependent coefficients. Braz. J. Mech. Sci. RBCM, V.IX4, 269?291