Disco de Newton com LEDs

by M V Silveira, R B Barthem

Ensino da visão cromática através de aparato com LED's coloridos

by M.V. Silveira, R.B. Barthem

A note on the seasonally shifting zone of high primary production in the Bay of Marajó, Pará, Brazil, 1983-1984

by H.O Schwassmann, R.B Barthem, M.L Carvalho
Published 1988-01-01