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Burton, M. D., Hitzig, B. M., & Johnson, D. C. (1994). Viability of the neonatal rat isolated brainstem preparation by 31P MRS. Neuroscience Letters, 169(1-2), 31–34. doi:10.1016/0304-3940(94)90349-2 
10.1016/0304-3940(94)90349-2