@inproceedings{akhter2009defense, title = {In Defense of Orthonormality Constraints for Nonrigid Structure from Motion}, author = {Akhter, Ijaz and Sheikh, Yaser and Khan, Sohaib}, booktitle = {Computer Vision and Pattern Recognition, 2009. CVPR 2009. IEEE Conference on}, pages = {2447-2453}, organization = {IEEE}, year = {2009}, doi = {} }