db/conf/pos/DearleBFHLNRV94.html Alan Dearle Rex di Bona James Farrow Frans A. Henskens Anders Lindström Stephen Norris John Rosenberg Francis Vaughan Protection in Grasshopper: A Persistent Operating System. 60-78 POS/1994/P060.pdf 1994 conf/pos/1994 POS db/conf/pos/pos94.html#DearleBFHLNRV94