Sprafke, A. N. Photonics for Solar Energy Systems IX. SPIE Digital Library.
Lua i Stíl Chicago (17ú heag.)Sprafke, Alexander N. Photonics for Solar Energy Systems IX. SPIE Digital Library.
Lua MLA (9ú heag.)Sprafke, Alexander N. Photonics for Solar Energy Systems IX. SPIE Digital Library.
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