Vinu Vijay Kumar John Lach Heterogeneous Redundancy for Fault and Defect Tolerance with Complexity Independent Area Overhead. 571- 2003 conf/dft/2003 DFT http://csdl.computer.org/comp/proceedings/dft/2003/2042/00/20420571abs.htm db/conf/dft/dft2003.html#KumarL03