BIBLIOGRAPHY
the first and older source Oskou named at inscription_ that is told is Shamsi Adad that it is Ashur king on 811-824 ( B.C ) in attach to sourth Orumieh pond  from three hang mountion (Oshkaya) of sky was told and tow inscriptions do cuments (Argishi avval)is one of the Oratu king that on 773-779 years (B.C) on a stone was writen attack to sorth Orumieh pond of capture the governor general of Oshkaya and oshkaya glen is told and third sourth is Sargoon inscription .it is other one of the Ashur kings that on 714 (B.C) at mountain flight (Aush) -Sahand- of open fort and 115 town its around that catched fire and all them are destroy is told .combination mean Oshkaya :
osh mean same three and kaya=gaya means a big stone .
in fact fort that was build on the top of the mountain that there is three big cliffs ycleped historical scientific of view ,this fort probably it is locate in the earth north of Oskou .