MRC2014: Extensions to the MRC format header for electron cryo-microscopy and tomography.
Cheng A, Henderson R, Mastronarde D, Ludtke SJ, Schoenmakers RH, Short J, Marabini R, Dallakyan S, Agard D, Winn M. MRC2014: Extensions to the MRC format header for electron cryo-microscopy and tomography. J Struct Biol. 2015 Nov; 192(2):146-50.