What is Bush Mosteller algorithm?

Question

I cannot find anything interesting on the internet. What is the Bush Mosteller stochastic model? ${}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}$

Answer 1

The original paper seems to be

Robert R. Bush and Frederick Mosteller, A Stochastic Model with Applications to Learning, Ann. Math. Statist. Volume 24, Number 4 (1953), 559–585.