Schmeisser M, Heisen BC, Luettich M, Busche B, Hauer F, Koske T, Knauber KH, Stark H. Parallel, distributed and GPU computing technologies in single-particle electron microscopy. Acta Crystallogr D Biol Crystallogr. 2009 Jul;65(Pt 7):659–71. PMID: 19564686; PMCID: PMC2703572.