@article {17677,
	title = {A note on generalized and hypergeneralized projectors},
	journal = {Linear Algebra and its Applications},
	volume = {412},
	year = {2006},
	month = {2006/01/15/},
	pages = {408 - 411},
	abstract = {Gro{\ss} and Trenkler [Generalized and hypergeneralized projectors, Linear Algebra Appl. 264 (1997) 463{\textendash}474] have introduced two generalizations of orthogonal projectors called generalized projectors and hypergeneralized projectors. In this note we characterize these generalizations by their spectral decompositions.},
	keywords = {Generalized projection, projection, Spectral decomposition},
	isbn = {0024-3795},
	doi = {10.1016/j.laa.2005.07.022},
	url = {http://www.sciencedirect.com/science/article/pii/S0024379505003836},
	author = {Stewart, G.W.}
}
