MALLICK, T.K. and SELLAMI, N. 2013. Optical concentrator and associated photovoltaic devices. International patent application PCT/GB2012/053221. International publication number WO 2013/093487A2, published 27.06.2013. Available from: https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2013093487