Spectral decomposition theorem for compact self-adjoint operators in prehilbert spaces. Lárez, Hanzel — 2005 Electronic Journal of Differential Equations (EJDE) [electronic only]
Interior controllability of a 2 × 2 reaction-diffusion system with cross-diffusion matrix. Larez, Hanzel; Leiva, Hugo — 2009 Boundary Value Problems [electronic only]