@article{de102341a9224d57bd7d014ef9a43799,
title = "Use of negative quartet cosine invariants as a phasing figure of merit: NQEST",
author = "\{De Titta\}, \{G. T.\} and Edmonds, \{J. W.\} and Langs, \{D. A.\} and H. Hauptman",
year = "1975",
month = jul,
doi = "10.1107/S0567739475001039",
language = "English",
volume = "31",
pages = "472--479",
journal = "Acta Crystallographica Section A: Foundations of Crystallography",
issn = "0108-7673",
publisher = "International Union of Crystallography",
number = "4",
}