by Viljoen, J.H., Muller, C.J., Craig, I.K.
Published in Journal of process control (01.08.2018)

by Hooper, A.S.C., Viljoen, J.H.
Published in South African journal of library and information science (01.01.2010)

by Viljoen, J.H., Muller, C.J., Craig, I.K.
Published in Control engineering practice (01.04.2020)

by Viljoen, J.H., Underwood, P.G.
Published in South African journal of library and information science (26.01.2014)

by Viljoen, J.H
Published in Onderstepoort journal of veterinary research (1970)

by Viljoen, J.H.
Published in Journal of stored products research (1990)

by Viljoen, J.H, Coetzer, J.A.W
Published in Onderstepoort journal of veterinary research (1982)

by Rheeder, J.P., Sydenham, E.W., Marasas, W.F.O., Thiel, P.G., Shephard, G.S., Schlechter, M., Stockenstrom, S., Cronje, D.W.&Viljoen, J.H.
Published in South African journal of science (01.03.1995)

by Viljoen, J.H
Published in Journal of the South African Veterinary Association (1976)

by Viljoen, J.H
Published in Phytophylactica (1976)

by Viljoen, J.H
Published in S Afr Vet Med Ass J (1972)

by Viljoen, J.H
Published in Onderstepoort journal of veterinary research (01.09.1978)

by Viljoen, J.H, Coetzer, J.J, Vermaak, C.J
Published in Developments in agricultural engineering (1984)

by Viljoen, J.H, Coetzer, J.J, Vermaak, C.J
Published in Phytophylactica (1981)

by Hecht, T, Viljoen, J.H
Published in Water S. A. (1982)

by Viljoen, J.H, Coetzer, J.A.W
Published in Onderstepoort journal of veterinary research (01.03.1982)

by Viljoen, J H
Published in Journal of the South African Veterinary Association (01.03.1972)

by Nevill, E.M, Viljoen, J.H
Published in Onderstepoort journal of veterinary research (01.06.1984)

by Dippenaar Schoeman, A.S, Genis, N. de L, Van Ark, H, Viljoen, J.H
Published in Phytophylactica (1978)

by Strydom, N.B., Morrison, J.F., van Graan, C.H., Viljoen, J.H. & Heyns, A.J.A.
Published in South African medical journal (28.12.1968)