Journal Article Controllability of a system of parabolic equations with non-diagonal diffusion matrix Get access Hugo Leiva Hugo Leiva Universidad de los Andes, Facultad de Ciencias, Departamento de Matemática, Mérida 5101, Venezuela Search for other works by this author on: Oxford Academic Google Scholar IMA Journal of Mathematical Control and Information, Volume 22, Issue 2, June 2005, Pages 187–199, https://doi.org/10.1093/imamci/dni023 Published: 01 June 2005