Bruce G. Lindsay Laura M. Haas C. Mohan Paul F. Wilms Robert A. Yost Computation and Communication in R*: A Distributed Database Manager ACM Trans. Comput. Syst. 2 1 1984 24-38 http://doi.acm.org/10.1145/2080.357390 db/journals/tocs/tocs2.html#LindsayHMWY84