(Aside: this is one reason why I have so little trust in the web as a long-term historical medium.)
Although that article focused primarily on oil futures, it also discussed commodities futures, and specifically addressed the rollovers. Unfortunately, I neither understood it well enough at the time, nor remember it well enough now, to regurgitate it. Maybe someone else will come along with a cached copy.
Nah; the previous version of the article I linked was completely different. For some reason, the author felt the need to take it down and replace it with links to these other articles.
(Aside: this is one reason why I have so little trust in the web as a long-term historical medium.)
Although that article focused primarily on oil futures, it also discussed commodities futures, and specifically addressed the rollovers. Unfortunately, I neither understood it well enough at the time, nor remember it well enough now, to regurgitate it. Maybe someone else will come along with a cached copy.