Maarten Pennings S. Doaitse Swierstra Harald Vogt Using Cached Functions and Constructors for Incremental Attribute Evaluation. 130-144 1992 conf/plilp/1992 PLILP db/conf/plilp/plilp92.html#PenningsSV92 http://dx.doi.org/10.1007/3-540-55844-6_91