There are two basic types: one has a double up front, after the leading accent; the other starts with alternating strokes, and ends with a double.
RLR
RLLRLRL
RLLRRLLR
Everybody Good Knows The Same Stuff, Part 1000:
Another handout from a clinic Russ Tincher at UC Berkeley in 1989— I confirmed that's where it was from. Here he shows how to interpret triplets with Reed or Bellson, and details a practice system for it, based on paradiddle-diddles. Or six stroke rolls, more accurately— that terminology wasn't universal then.
In John Ramsay's Alan Dawson book there's a similar system he calls “Ruff bossa.” The only difference is in how you interpret a (written) beat of 8th notes. Dawson plays them as alternating swing 8th notes, without filling in the triplet:
This system is probably best for using with the first couple of pages of Bellson, which has just quarter notes and offbeat 8th notes only, but we'll see, I'll play around with it when I have some time to practice.