CYPRIAN, O. S., ANDREW MASIBAYI, and N. B. OKELO. “ON THE JOINT ESSENTIAL MAXIMAL NUMERICAL RANGES”. IJRDO -JOURNAL OF MATHEMATICS 1, no. 1 (May 31, 2015): 29-33. Accessed December 5, 2024. http://467182.nmy9asj5x.asia/index.php/m/article/view/2400.