Thirion, G J2012-08-282012-08-281988Thirion, G.J. 1988. Grootklasonderrig: 'n mite of moontlikheid?. Yesterday & today = Gister en vandag, 16:7-11, Sep. [http://www.sashtw.org.za/index2.htm] [http://dspace.nwu.ac.za/handle/10394/5126]2223-0386http://hdl.handle.net/10394/7097otherArticle