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Gorelli, Federico A.; Lorenzo Ulivi; Mario Santoro; Roberto Bini (1999). «The ε Phase of Solid Oxygen: Evidence of an O4 Molecule Lattice». Physical Review Letters83 (20): 4093-4096. Bibcode:1999PhRvL..83.4093G. doi:10.1103/PhysRevLett.83.4093.
Lars F. Lundegaard, Gunnar Weck, Malcolm I. McMahon, Serge Desgreniers and Paul Loubeyre (2006). «Observation of an O8 molecular lattice in the phase of solid oxygen». Nature443 (7108): 201-204. Bibcode:2006Natur.443..201L. PMID16971946. doi:10.1038/nature05174.
Hernández-Lamoneda, R.; A. Ramírez-Solís (2000). «Reactivity and electronic states of O4 along minimum energy paths». Journal of Chemical Physics113 (10): 4139-4145. Bibcode:2000JChPh.113.4139H. doi:10.1063/1.1288370.
Lars F. Lundegaard, Gunnar Weck, Malcolm I. McMahon, Serge Desgreniers and Paul Loubeyre (2006). «Observation of an O8 molecular lattice in the phase of solid oxygen». Nature443 (7108): 201-204. Bibcode:2006Natur.443..201L. PMID16971946. doi:10.1038/nature05174.