The Reg Park 5x5 style is documented here in the articles section. I have been using that style of 5x5 for awhile now. Parks advanced work was pretty much all out across the week. I could be wrong about this though.
The HLM day concept is really documented in Bill Starrs work, and in the Casey Butt thread in the bodybuilding section. If you haven't read that thread yet, you owe it to yourself to go read it.