http://www.nber.org/papers/w13953.pdf

http://cep.lse.ac.uk/pubs/download/dp1246.pdf

The last one they muddy the waters quite a big where they talk about a "net decoupling" and "gross decoupling". The first they use the same deflator and the second they use a different deflator. Using different deflators for wages and productivity means you're comparing apples to oranges.

Economists Donald Boudreaux and Liya Plagashvili discuss the topic in greater detail in this WSG op-ed https://www.wsj.com/articles/donald-boudreaux-and-liya-palag...