The best article I've found is the google books
partial reproduction of the RPG document.
It suggests five periods as being a good target.
It also covers the concept of adding a constant inside that modulus that is at the heart of QRDude running in advanced mode.
Also mentioned is the Plate frequency.
As good as the article is, it doesn't answer the question of whether a single large order panel is better or worse than a Barker sequence of lower order panels comprising a similar number of wells. Perhaps that is covered on the missing pages. Lupo is the only person we know that could actually afford the book!