Norms on possibilities I : forcing with trees and creatures /
Rosłanowski, Andrzej,1960-
Shelah, Saharon.
Providence, R.I. : American Mathematical Society,
c1999.
"September 1999, volume 141, number 671 (first of 4 numbers)."
Includes bibliographical references (p. 166-167).
Set theory.
Forcing (Model theory)