1. Al-Ansary, H., Ba-abbad, M., 2010. Glass receiver with bifurcated annulus responsive to thermal dimensional changes. US Patent Application No.: 12/718,960.
2. Natural convection in air-filled horizontal cylindrical annuli;Alshahrani;Alexandria Engineering Journal,2005
3. Natural convection in horizontal annulus with fins attached to inner cylinder;Alshahrani;International Journal of Heat and Technology,2006
4. Natural convection oscillatory flow in cylindrical annuli;Bishop;International Journal of Heat and Mass Transfer,1968
5. Burkholder, F., Kutscher, C., 2009. Heat Loss Testing of Schott’s 2008 PTR70 Parabolic Trough Receiver. NREL Technical Report: NREL/TP-550-45633.