nyrath, 
From Dr. Philip Metzger. The culmination of 27 years’ work.
How to design a rocket to land on the Lunar surface WITHOUT the damn engine exhaust excavating a big hole and causing a ship-destroying crash.
Erosion rate of lunar soil under a landing rocket, part 1: identifying the rate-limiting physics
Erosion rate of lunar soil under a landing rocket, part 2: benchmarking and predictions
