المؤلفون: Tendayi, T. G., Fourie, C. J.

المصدر: WIT Transactions on The Built Environment ; Sustainable Development ; page 889-900 ; ISSN 1743-3509

الاتاحة: http://dx.doi.org/10.2495/sd150782
http://www.witpress.com/Secure/elibrary/papers/SD15/SD15078FU2.pdf