Keith O. Geddes Gaston H. Gonnet Trevor J. Smedley Heuristic Methods for Operations With Algebraic Numbers. (Extended Abstract) 475-480 1988 conf/issac/1988 ISSAC db/conf/issac/issac88.html#GeddesGS88 http://dx.doi.org/10.1007/3-540-51084-2_45