J. A. Van Zyl

Sperm morphologic features as a prognostic factor in in vitro fertilization

Thinus F. Kruger, Roelof Menkveld, F. S. H. Stander et al. · Fertility and Sterility · 1986 · 1.2K citations

Veterinary Medicine, Cell Biology, Obstetrics +16

The evaluation of morphological characteristics of human spermatozoa according to stricter criteria

Roelof Menkveld, F. S. H. Stander, T. Kotze et al. · Human Reproduction · 1990 · 675 citations

Veterinary Medicine, Biostatistics, Obstetrics +17

Randomized comparison of tamoxifen and two separate doses of toremifene in postmenopausal patients with metastatic breast cancer.

D F Hayes, J. A. Van Zyl, A Hacking et al. · Journal of Clinical Oncology · 1995 · 220 citations

Medicine, Oncology, Pharmacology +16

Chromosome studies in 496 infertile males with a sperm count below 10 million/ml

A.E. Retief, J. A. Van Zyl, Roelof Menkveld et al. · Human Genetics · 1984 · 109 citations

Medicine, Genetics, Molecular Genetics +14

Oligozoospermia: a seven-year survey of the incidence, chromosomal aberrations, treatment and pregnancy rate.

J. A. Van Zyl, Roelof Menkveld, Kotze T.J.V.W. · PubMed · 1975 · 82 citations

Medicine, Obstetrics, Infertility +15