@misc{Mayr1997diss, author = {Mayr, Rudolf H.}, year = {1997}, school = {Rijksuniversiteit Leiden}, title = {The seal impressions of {Ur} {III} {Umma}}, type = {phdthesis}, } @book{Sigrist2009BPOA6, address = {Madrid}, author = {Sigrist, Marcel and Tohru, Ozaki}, number = {6}, series = {Biblioteca del {Pr}{\' o}ximo {Oriente} {Antiguo}}, year = {2009}, publisher = {Consejo Superior de Investigaciones Cient{\' i}ficas}, title = {Neo-{Sumerian} administrative tablets from the {Yale} {Babylonian} {Collection}. {Part} one}, }