Nice! There's a paper in there called 'Block-free concurrent GC: stack scanning and copying' which opens by claiming that "on-the-fly Garbage Collectors (GCs) are the state-of-the-art concurrent GC algorithms today". I'd never heard of on-the-fly GC, so i've learned something!
However, on googling, i find that Edsger Dijkstra wrote about it in 1975:
