Convergent and divergent solutions of singular partial differential equations with resonance or small denominators,
Publications of RIMS, Kyoto University, 43, (2007), 923-943.
WKB analysis and Poincar\'e theorem for vector fields,
Proceeding of the Conference "Algebraic Analysis of Differential Equations" in honor of Prof. Kawai,
Springer Verlag, (2007), 335-352.
Singular partial differential equations with resonance and small denominators,
Proceeding of the Conference "Algebraic, Analytic and Geometric Aspects
of Complex Differential Equations and their Deformations. Painlev\'e Hierarchies" ,
RIMS K\^oky\^uuroku Bessatsu, B2 (2007), 261-265.