8Phylipsen GJM, Alsema EA. Environmental life-cycle assessment of multicrystalline silicon solar cell modules. A study by commission of the Netherlands Agency for Energy and the Environment. Utrecht University. 1995.
9Cox LA, Jr. An exposure-response threshold for lung diseases and lung cancer caused by crystalline silica. Risk Anal, 2011, 31:1543-1560.
10Lee KY, Yoon YY, Jeong SB, Chae YB, Ko KS. Acid leaching purification and neutron activation analysis of high purity silicas. J Radioanal Nucl C, 2009, 282:629-633.