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Spec	Title	Releases	WG
36.423	Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 Application Protocol (X2AP)	18.2.0 17.7.0 16.13.0 15.14.0 14.8.0 13.8.0 12.9.0 11.9.0 10.7.0 9.6.0 8.9.0	R3

All information on this page is aggregated from the 3GPP Specfication Status Report page.