On a Local Existence Theorem of Neumann Problem for Some Quasilinear Hyperbolic Systems of 2nd Order. Yoshihiro Shibata; Gen Nakamura — 1989 Mathematische Zeitschrift
Global uniqueness for an inverse boundary problem arising in elasticity. Gen Nakamura; Gunther Uhlmann — 1994 Inventiones mathematicae
On the singularities of the solution of the Cauchy problem for the operator with non uniform multiple characteristics Yûsaku Hamada; Gen Nakamura — 1977 Annali della Scuola Normale Superiore di Pisa - Classe di Scienze