Very elegant and very unimplementable at the time. The make They seem to avoid the under sized address ranges which time and again plague computing. eg. -IBM mainframe OSs with below/above the line addressing. -The 1MB 8086 & Dos Limit and the hacks that followed (EMS,XMS) etc.) for more than a decade. The Disk access size limitations in the same era. - IPV4 address depletion. The authors in 1980 seem to be aware the issue would be there but I don't see how the thrashing could have been avoided even if 1980's developers/designers had read the paper when it was published.