by Borowski, C.A., Goplen, S.P., Gronhovd, S.
Published in Proceedings of IEEE Frontiers in Education Conference - FIE '93 (1993)

by Barbee, D.G, Goplen, S.P, Thomas, O.B, Nuckolls, C.E
Published in J Agr Eng Res (1973)

by Barbee, D.G., Goplen, S.P., Thomas, O.B., Nuckolls, C.E.
Published in Journal of agricultural engineering research (01.01.1973)