Tilings, Quasicrystals, Discrete Planes, Generalized Substitutions, and Multidimensional Continued Fractions. - Pierre Arnoux; Valérie Berthé; Hiromi Ei; Shunji Ito (DM-CCG, 2001)

Tilings from some non-irreducible, Pisot substitutions. - Shunji Ito; Hiromi Ei (Discret. Math. Theor. Comput. Sci., 2005)

On substitution invariant Sturmian words: an application of Rauzy fractals. - Valérie Berthé; Hiromi Ei; Shunji Ito; Hui Rao (RAIRO Theor. Informatics Appl., 2007)

Stepped surfaces and Rauzy fractals induced from automorphisms on the free group of rank 2. - Hiromi Ei (Theor. Comput. Sci., 2014)