NASA Reference Publication. National Aeronautics and Space Administration, Scientific and Technical Information Branch. 1979. pp. x. Retrieved 29 July 2022.
Deepa, M.; Joshi, A. G.; Srivastava, A. K.; Shivaprasad, S. M.; Agnihotry, S. A. (2006). "Electrochromic Nanostructured Tungsten Oxide Films by Sol-gel: Structure and Intercalation Properties". Journal of the Electrochemical Society. 153 (5): C365. Bibcode:2006JElS..153C.365D. CiteSeerX10.1.1.949.7131. doi:10.1149/1.2184072.
Deepa, M.; Joshi, A. G.; Srivastava, A. K.; Shivaprasad, S. M.; Agnihotry, S. A. (2006). "Electrochromic Nanostructured Tungsten Oxide Films by Sol-gel: Structure and Intercalation Properties". Journal of the Electrochemical Society. 153 (5): C365. Bibcode:2006JElS..153C.365D. CiteSeerX10.1.1.949.7131. doi:10.1149/1.2184072.
Deepa, M.; Joshi, A. G.; Srivastava, A. K.; Shivaprasad, S. M.; Agnihotry, S. A. (2006). "Electrochromic Nanostructured Tungsten Oxide Films by Sol-gel: Structure and Intercalation Properties". Journal of the Electrochemical Society. 153 (5): C365. Bibcode:2006JElS..153C.365D. CiteSeerX10.1.1.949.7131. doi:10.1149/1.2184072.