Peter Jipsen Alexander Pinus Henry Rose Rudin-Keisler Posets of Complete Boolean Algebras. 447-454 2001 47 Math. Log. Q. 4 http://dx.doi.org/10.1002/1521-3870(200111)47:4<447::AID-MALQ447>3.0.CO;2-W db/journals/mlq/mlq47.html#JipsenPR01