Samuel R. Buss Dima Grigoriev Russell Impagliazzo Toniann Pitassi Linear Gaps Between Degrees for the Polynomial Calculus Modulo Distinct Primes (Abstract). 5 1999 IEEE Conference on Computational Complexity http://computer.org/proceedings/coco/0075/00750005abs.htm db/conf/coco/coco1999.html#BussGIP99