@article {43245,
	title = {Orbital optimization in the density matrix renormalization group, with applications to polyenes and ss-carotene},
	journal = {Journal of Chemical Physics},
	volume = {128},
	year = {2008},
	month = {APR},
	doi = {10.1063/1.2883976},
	author = {Ghosh, Debashree and Hachmann, Johannes and Yanai, Takeshi and Chan, Garnet Kin-Lic}
}
