Runji, F. M.Agure, J. O.Nyamwala, F. O.2017-09-142017-09-142017International Mathematical Forum, Vol. 12, 2017, no. 6, 277 - 283http://karuspace.karu.ac.ke/handle/20.500.12092/2009doi.org/10.12988/imf.2017.611148enNumerical rangeGeneralized DerivationOn the Numerical Range of a Generalized DerivationArticle