Alberto Bartesaghi Pablo Sprechmann Gregory Randall Guillermo Sapiro Sriram Subramaniam Classification, Averaging and Reconstruction of Macromolecules in Electron Tomography. 244-247 2007 ISBI http://dx.doi.org/10.1109/ISBI.2007.356834 conf/isbi/2007 db/conf/isbi/isbi2007.html#BartesaghiSRSS07