A Fast Bit-Parallel Algorithm for Computing the Subset Partial Order.

Paul Pritchard A Fast Bit-Parallel Algorithm for Computing the Subset Partial Order. 76-86 1999 24 Algorithmica 1 http://link.springer.de/link/service/journals/00453/bibs/24n1p76.html db/journals/algorithmica/algorithmica24.html#Pritchard99