Mumpar-Victoria, M. R. L. (1999). Perturbations of a Class of ordinary differential expressions preserving the essential spectrum and the nullities. Science Diliman.
Chicago-referens (17:e uppl.)Mumpar-Victoria, Marie Redina L. "Perturbations of a Class of Ordinary Differential Expressions Preserving the Essential Spectrum and the Nullities." Science Diliman 1999.
MLA-referens (9:e uppl.)Mumpar-Victoria, Marie Redina L. "Perturbations of a Class of Ordinary Differential Expressions Preserving the Essential Spectrum and the Nullities." Science Diliman, 1999.
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