Variety of \mathfrak{sa}(X)
RIMS Koukyuroku 1595 `Axiomatic set theory and set-theoretic topology':89-96, 2008.
Club guessing on \mathcal{P}_\kappa\lambda
RIMS Koukyuroku 1530 `The interplay between set theory of the reals and iterated forcing':103-109, 2007.
How many miles to \beta\omega? II
(with Masaru Kada and Kazuo Tomoyasu)
RIMS Koukyuroku 1419 `Set Theoretic and Geometric Topology and Its Applications':105-125, 2005.
Semi-ordered sets and games on posets
RIMS Koukyuroku 1202 `Axiomatic Set Theory':75-82, 2001.