Neat read. They note that the technique has been around for a while. "This method goes back to at least 1997: Agner Fog used this method in his open source lib

Neat read. They note that the technique has been around for a while. "This method goes back to at least 1997: Agner Fog used this method in his open source library [4], and others seemed to have invented it independently, too." [4] is a link to www.agner.org/random , which appears to contain much detailed information on efficient random number generation.