Yonatan Aumann Judit Bar-Ilan Uriel Feige On the Cost of Recomputing: Tight Bounds on Pebbling with Faults. 47-58 1994 conf/icalp/1994 ICALP db/conf/icalp/icalp94.html#AumannBF94 http://dx.doi.org/10.1007/3-540-58201-0_57