Update README.md

Author: pgleeson

README.md

@@ -2,7 +2,7 @@
 
 [![Continuous build using OMV](https://github.com/OpenSourceBrain/MainenEtAl_PyramidalCell/actions/workflows/omv-ci.yml/badge.svg)](https://github.com/OpenSourceBrain/MainenEtAl_PyramidalCell/actions/workflows/omv-ci.yml)
 
-Implementation of the Mainen et al. pyramidal cell model from: Mainen ZF, Joerges J, Huguenard JR, 
-Sejnowski TJ (1995) A model of spike initiation in neocortical pyramidal neurons. Neuron 15:1427-39. 
+Implementation of the Mainen et al. pyramidal cell model from: [Mainen ZF, Joerges J, Huguenard JR, 
+Sejnowski TJ (1995) A model of spike initiation in neocortical pyramidal neurons.](https://pubmed.ncbi.nlm.nih.gov/8845165/) Neuron 15:1427-39. 
 
 See http://www.opensourcebrain.org/projects/mainenetalpyramidalcell for more details.