Some authors use (a, b),[1][2][5] but this notation is often ambiguous. Andrews (1994, p. 16) explains this as: "Many authors write (a, b) for g.c.d.(a, b). We do not, because we shall often use (a, b) to represent a point in the Euclidean plane." Andrews, George E. (1994) [1971]. Number Theory. Dover. ISBN978-0-486-68252-5.
Adleman, L. M.; Kompella, K. (1988). "Using smoothness to achieve parallelism". 20th Annual ACM Symposium on Theory of Computing. New York. pp. 528–538. doi:10.1145/62212.62264. ISBN0-89791-264-0. S2CID9118047.
Adleman, L. M.; Kompella, K. (1988). "Using smoothness to achieve parallelism". 20th Annual ACM Symposium on Theory of Computing. New York. pp. 528–538. doi:10.1145/62212.62264. ISBN0-89791-264-0. S2CID9118047.