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https://repository.up.ac.za/handle/2263/28204
https://repository.up.ac.za/handle/2263/50685
https://repository.up.ac.za/handle/2263/6855
https://repository.up.ac.za/handle/2263/49746
https://repository.up.ac.za/handle/2263/51129
https://repository.up.ac.za/handle/2263/50878
https://repository.up.ac.za/handle/2263/50875
https://repository.up.ac.za/handle/2263/50895
https://repository.up.ac.za/handle/2263/50893
https://repository.up.ac.za/handle/2263/48314
https://repository.up.ac.za/handle/2263/48307
https://repository.up.ac.za/handle/2263/64660