by Deelder, A M, De Jonge, N, Fillié, Y E, Kornelis, D, Helaha, D, Qian, Z L, De Caluwé, P, Polderman, A M
Published in The American journal of tropical medicine and hygiene (01.01.1989)

by Wolff, H L, Croon, J J, Helaha, D
Published in Acta Leidensia (01.12.1977)

by Wolff, H L, Croon, J J, Helaha, D
Published in Acta Leidensia (1978)

by Wolff, H L, van Zijl, W J, Croon, J J, Helaha, D
Published in Acta Leidensia (01.12.1977)