Add reference links

README.md

@@ -6,4 +6,12 @@
 
 
 ## SD-RAN
-[See files of SD-RAN here](sd-ran/)
\ No newline at end of file
+[See files of SD-RAN here](sd-ran/)
+
+
+## Important Links
+[OAI Reference Architecture for 5G and 6G Research with USRP](https://kb.ettus.com/OAI_Reference_Architecture_for_5G_and_6G_Research_with_USRP/)
+
+[OpenAirInterface 5G Core Network Deployment and Testing with gnbsim](https://gitlab.eurecom.fr/oai/cn5g/oai-cn5g-fed/-/blob/master/docs/DEPLOY_SA5G_SLICING.md)
+
+[Testing gNodeB with COTS UE](https://gitlab.eurecom.fr/oai/openairinterface5g/-/blob/develop/doc/TESTING_GNB_W_COTS_UE.md)