Thompson, Scott Kevin; Priestley, Tony; Smith, Roger Astbury; Saha, Ashis K.; Rudra, Sonali; Hajra, Arun Kuma; Chatterjee, Dipanwita; Behrens, Carl Henry; He, Yigang; Li, Hui-Yin Patent: US2012/214809 A1, 2012 ; US 20120214809 A1