It wasn't that one, it was just a webpage (very detailed) with the measurement methodology, pictures of the equipment and the cranks, and graphed results. It was posted in SSFG, but I can't find it - you know as well as I do how broken the search is here. It was a thread about merits and demerits of Sugino 75s.

Besides a (cursory, I admit) look at that paper tells me that it doesn't deal with crankset stiffness.

By the way, I did read the paper presented in the edition of Human Power to which this one refers to! It was an excellent read, and one that contributed, in part, to me going singlespeed.