Ritter, N.M. & Smith, D.D. & Campbell, J.W. (1987)
Glutamine Synthetase in Liver and Brain Tissues of the Holocephalan, Hydrolagus colliei. Journal of Experimental Zoology, 243, 181–188
DOI: 10.1002/jez.1402430203

Smith, D.D. & Ritter, N.M. & Campbell, J.W. (1987)
Glutamine synthetase isozymes in elasmobranch brain and liver tissues. Journal of Biological Chemistry, 262(1), 198–202