TY - RPRT TI - Three-dimensional reconstruction with contrast transfer function correction from energy-filtered cryoelectron micrographs: procedure and application to the 70S Escherichia coli ribosome. AU - J Zhu AU - P A Penczek AU - R Schröder AU - J Frank PY - 1997 DO - 10.1006/jsbi.1997.3845 UR - https://pubmed.ncbi.nlm.nih.gov/9169230/ ID - 9169230 ER -