On Sprindzuk's classification of transcendental numbers. Masaaki Amou — 1996 Journal für die reine und angewandte Mathematik
Algebraic independence of the values of certain functions at a transcendental number Masaaki Amou — 1991 Acta Arithmetica
Arithmetical properties of the values of functions satisfying certain functional equations of Poincaré Masaaki Amou; Masanori Katsurada; Keijo Väänänen — 2001 Acta Arithmetica
On Siegel-Shidlovskii's theory for q-difference equations Masaaki Amou; Tapani Matala-aho; Keijo Väänänen — 2007 Acta Arithmetica