@article {14106,
	title = {A note on conjugate gradient convergence},
	journal = {Numerische Mathematik},
	volume = {76},
	year = {1997},
	month = {1997///},
	pages = {209 - 230},
	author = {Naiman, A. E and Babu{\v s}ka, I. M and Elman, Howard}
}
