You got a source for that wear = k(load)^5 formula?

Edit: to the person who downvoted me, I found a research paper saying it's actually proportional to load to the power of four.

I'm just checking if it's a mistake, or if there's another paper which arrived on a different result.

[Link to download the paper](http://www.nvfnorden.org/lisalib/getfile.aspx?itemid=261)