Executing code in the past: efficient in-memory object graph versioning.

Frédéric Pluquet Stefan Langerman Roel Wuyts Executing code in the past: efficient in-memory object graph versioning. 771-772 2009 OOPSLA Companion http://doi.acm.org/10.1145/1639950.1640007 conf/oopsla/2009c db/conf/oopsla/oopsla2009c.html#PluquetLW09a