John Miles Smith Philip A. Bernstein Umeshwar Dayal Nathan Goodman Terry A. Landers Ken W. T. Lin Eugene Wong Multibase: integrating heterogeneous distributed database systems. 487-499 1981 AFIPS National Computer Conference http://doi.acm.org/10.1145/1500412.1500483 conf/afips/1981 db/conf/afips/ncc81.html#SmithBDGLLW81