Mumpar-Victoria, M. R. L. (1999). Perturbations of a Class of ordinary differential expressions preserving the essential spectrum and the nullities. Science Diliman.
Chicago Style (17th ed.) CitationMumpar-Victoria, Marie Redina L. "Perturbations of a Class of Ordinary Differential Expressions Preserving the Essential Spectrum and the Nullities." Science Diliman 1999.
MLA (9th ed.) CitationMumpar-Victoria, Marie Redina L. "Perturbations of a Class of Ordinary Differential Expressions Preserving the Essential Spectrum and the Nullities." Science Diliman, 1999.
Warning: These citations may not always be 100% accurate.