Date: Mon, 13 Mar 89 11:39:28 PDT
The rule
C,a<b |- s < t
(RL) --------------------------
C |- (rec a s) < (rec b t)
appears in
\bibitem[Car86]{amber}
L.~Cardelli.
\newblock Amber.
\newblock In {\em Combinators and Functional Programming Languages, LNCS 242},
pages 21--47, 1986.