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Strikie´, N., Klarica, M., Vladic´, A., & Bulat, M. (1994). Effect of active transport on distribution and concentration gradients of [3H]benzylpenicillin in the cerebrospinal fluid. Neuroscience Letters, 169(1-2), 159–162. doi:10.1016/0304-3940(94)90380-8 
10.1016/0304-3940(94)90380-8