Retrieved 19 May 2010. ↑ "PNaCl: Portable Native Client Executables" (PDF). Archived from the original (PDF) on 2 May 2012. Retrieved 25 April 2012. ↑ David Sehr; Robert Muth; Cliff L. Biffle; Victor Khimenko; Egor Pasko; Bennet Yee; Karl Schimpf; Brad Chen (2010).