by Pena, N.B
Year of Publication 01.05.1987

by Pena, N.B, Shepard, B.M
Year of Publication 1986

by Jarvis, Bruce B., Pena, Norman B., Cömezóg̀lu, S.Nilgün, Rao, M.Madhusudana
Published in Phytochemistry (Oxford) (01.01.1986)

by Pena, N.B, Perfect, T.J, Shepard, B.M
Year of Publication 1984

by Gabriel, B.P, Rapusas, H.R, Pena, N.B
Published in NSDB technology journal - National Science Development Board (Philippines) (1980)

by Jarvis, B.B, Pena, N.B, Madhusudana Rao, M, Comezoglu, N.S, Comezoglu, T.F, Mandava, N.B
Published in ACS symposium series (1985)

by Rubia, E.G, Pena, N.B, Almazan, L.P. (International Rice Research Inst., Manila (Philippines). Entomology Div.), Shepard, B.M
Published in Journal of Plant Protection in the Tropics (Malaysia) (01.08.1990)

by Almazan, L.P, Rubia, E.G, Pena, N.B, Dulay, A, Shepard, B.M. (International Rice Research Inst., Los Banos, Laguna (Philippines))
Year of Publication 1988

by Gabriel, B.P, Rapusas, H.R, Pena, N.B. (University of the Philippines at Los Banos, College, Laguna. Dept. of Entomology)
Published in NSDB [National Science Development Board] Technology Journal (Philippines) (01.01.1980)