Yozo Hida Xiaoye S. Li David H. Bailey Algorithms for Quad-Double Precision Floating Point Arithmetic. 155-162 2001 conf/arith/2001 IEEE Symposium on Computer Arithmetic http://csdl.computer.org/comp/proceedings/arith/2001/1150/00/11500155abs.htm db/conf/arith/arith2001.html#HidaLB01