AUTHOR = {Dewar,  M. C.},
   TITLE = {{IRENA -- An Integrated Symbolic and Numerical
                  Computation Environment}},
   BOOKTITLE = {{Proc. of the ACM-SIGSAM International Symposium on Symbolic
 and Algebraic Computation (ISSAC'89), Portland, Oregon}},
   Editor = {G. H. Gonnet},
   Pages = {171-179},
   Publisher = {ACM Press},
   Year = {1989}
}