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Prischi F, Pastore A (2016). "Application of Nuclear Magnetic Resonance and Hybrid Methods to Structure Determination of Complex Systems". Advanced Technologies for Protein Complex Production and Characterization. review. Advances in Experimental Medicine and Biology. Vol. 896. pp. 351–368. doi:10.1007/978-3-319-27216-0_22. ISBN978-3-319-27214-6. PMID27165336.
Wells JN, Marsh JA (2018). "Experimental Characterization of Protein Complex Structure, Dynamics, and Assembly". Protein Complex Assembly. review. Methods in Molecular Biology. Vol. 1764. pp. 3–27. doi:10.1007/978-1-4939-7759-8_1. ISBN978-1-4939-7758-1. PMID29605905. Section 4: Nuclear Magnetic Resonance Spectroscopy
Zhang SW, Chen W, Yang F, Pan Q (October 2008). "Using Chou's pseudo amino acid composition to predict protein quaternary structure: a sequence-segmented PseAAC approach". Amino Acids. 35 (3): 591–598. doi:10.1007/s00726-008-0086-x. PMID18427713. S2CID689955.
Here quaternary means "fourth-level structure", not "four-way interaction". Etymologically quartary is correct: quaternary is derived from Latin distributive numbers, and follows binary and ternary; while quartary is derived from Latin ordinal numbers, and follows secondary and tertiary. However, quaternary is standard in biology.