Reference:
 - Author: Alexis Rohou and Nikolaus Grigorieff
   Title: >
     CTFFIND4: Fast and accurate defocus estimation from electron micrographs
   Journal: Journal of Structural Biology
   Year: 2015
   Volume: 192
   Number: 2
   Pages: 216-221
   DOI: 10.1016/j.jsb.2015.08.008
   PMID: 26278980
   PMCID: PMC6760662
   URL: https://www.sciencedirect.com/science/article/abs/pii/S1047847715300460
Registry:
 - Name: SciCrunch
   Entry: SCR_016732
