Andrey V. Zykov Gustavo de Veciana Exploring Density-Reliability Tradeoffs on Nanoscale Substrates: When do smaller less reliable devices make sense?. 105-113 2008 DFT http://dx.doi.org/10.1109/DFT.2008.30 conf/dft/2008 db/conf/dft/dft2008.html#ZykovV08