@book{1991--usenix-winter
,title={{Proceedings of the USENIX winter 1991 technical conference held in Dallas, Texas, January 21--25}}
,booktitle={{Proceedings of the USENIX winter 1991 technical conference held in Dallas, Texas, January 21--25}}
,publisher={USENIX Association}
,address={Berkeley}
,year={1991}
}