Henri Cohen Atsuko Miyaji Takatoshi Ono Efficient Elliptic Curve Exponentiation Using Mixed Coordinates. 51-65 http://link.springer.de/link/service/series/0558/bibs/1514/15140051.htm 1998 conf/asiacrypt/1998 ASIACRYPT db/conf/asiacrypt/asiacrypt98.html#CohenMO98