Thanks @User Here is a version of that paper outside a paywall: http://www.ece.virginia.edu/~mrs8n/conf/01046084.pdf . I found the semidynamic FF interesting . This was near the beginning of a decade of chasing the fastest, power/space efficient FF. This recent paper measures a lot of them in 130nm: http://www.ijeei.org/docs-1547620655d47f8cd6c64a.pdf