Hudson-Lamb, Gavin Charles; Schoeman, Johan P.; Hooijberg, Emma Henriette; Heinrich, Sonja K.; Tordiffe, Adrian Stephen Wolferstan(AOSIS OpenJournals, 2016-02-26)
Hartman, Marthinus Jacobus; Kirberger, Robert M.; Tordiffe, Adrian Stephen Wolferstan; Boy, Sonja Catharina; Schoeman, Johan P.(BMJ Publishing Group, 2015-02)