The Abu Temple was identified because an inscribed copper bowl found nearby was dedicated to him.
See:
- Henri Frankfort et all., Tell Asmar and Khafaje: the first season's work in Eshnunna, 1930/31, The Oriental Institute of the University of Chicago. Oriental Institute Communications, no. 13, 1932 - https://oi.uchicago.edu/sites/oi.uchicago.edu/files/uploads/shared/docs/oic13.pdf
- Henry Frankfort: Sculpture of the third millennium B.C. Tell Asmar and Khafajah, University of Chicago Press, 1939.