@article {Nicola-et-al-2011,
	title = {A general extending and constraining procedure for linear iterative methods},
	journal = {Int.~J.~Comp.~Math.},
	year = {2011},
	note = {in press},
	url = {http://dx.doi.org/10.1080/00207160.2011.634002},
	author = {Nicola, A. and Stefania Petra and Popa, C. and Christoph Schn{\"o}rr}
}
@article {Nicola-et-al-2011,
	title = {A general extending and constraining procedure for linear iterative methods},
	journal = {Int. J. Comp. Math.},
	year = {2011},
	note = {in press},
	url = {http://dx.doi.org/10.1080/00207160.2011.634002},
	author = {Nicola, A. and Petra, S. and Popa, C. and Schn{\"o}rr, C.}
}
@techreport {petra09b,
	title = {Accelerating Constrained SIRT with Applications in Tomographic Particle Image Reconstruction},
	year = {2009},
	institution = {IWR, University of Heidelberg},
	url = {http://www.ub.uni-heidelberg.de/archiv/9477},
	author = {Stefania Petra and Popa, C. and Christoph Schn{\"o}rr}
}
@techreport {popa09,
	title = {On a general extending and constraining procedure for linear iterative methods},
	year = {2009},
	institution = {IWR, University of Heidelberg},
	url = {http://www.ub.uni-heidelberg.de/archiv/9761},
	author = {Nicola, A. and Stefania Petra and Popa, C. and Christoph Schn{\"o}rr}
}
@techreport {popa09,
	title = {On a general extending and constraining procedure for linear iterative methods},
	year = {2009},
	month = {August},
	institution = {IWR, University of Heidelberg},
	type = {Technical Report},
	url = {http://www.ub.uni-heidelberg.de/archiv/9761},
	author = {Nicola, A. and Petra, S. and Popa, C. and Schn{\"o}rr, C.}
}
@conference {petra-wmm08,
	title = {Enhancing Sparsity by Constraining Strategies: Constrained SIRT versus Spectral Projected Gradient Methods},
	booktitle = {Proc. 7th Workshop on Modelling of Environmental and Life Sciences Problems (WMM 08)},
	year = {2008},
	month = {Oct. 22-Oct. 25},
	publisher = {Ed Acad Romane, Bucuresti},
	organization = {Ed Acad Romane, Bucuresti},
	address = {Constanta, Romania},
	author = {Petra, S. and Popa, C. and Schn{\"o}rr, C.}
}
@conference {Petra-et-al-08b,
	title = {Enhancing Sparsity by Constraining Strategies: Constrained SIRT versus Spectral Projected Gradient Methods},
	booktitle = {Proc. 7th Workshop on Modelling of Environmental and Life Sciences Problems (WMM 08)},
	series = {Ed Acad Romane},
	year = {2008},
	address = {Bucharest, Romania},
	author = {Petra, S. and Popa, C. and Schn{\"o}rr, C.}
}
