Tucker, J., Tucker, J. V., & Zucker, J. I. (2004). Abstract versus concrete computation on metric partial algebras. ACM Transactions on Computational Logic, 5(4), p. 611. doi:10.1145/1024922.1024924

Tucker, John, J. V. Tucker, and J. I. Zucker. "Abstract Versus Concrete Computation On Metric Partial Algebras." ACM Transactions On Computational Logic 5, no. 4 (2004): 611.

Tucker, John, J. V. Tucker, and J. I. Zucker. "Abstract Versus Concrete Computation On Metric Partial Algebras." ACM Transactions On Computational Logic 5.4 (2004): 611.