added Aertsen papers

references.bib

@@ -22,7 +22,7 @@
   publisher={Optical Society of America}
 }
 
-@article{Aertsen1981,
+@article{Aertsen1981b,
   title={{The spectro-temporal receptive field: a functional characteristic of auditory neurons}},
   author={Aertsen, Ad M H J and Johannesma, P I M},
   journal={Biological Cybernetics},
@@ -7085,3 +7085,31 @@ microelectrode recordings from visual cortex and functional implications.},
   volume={392},
   pages={321–-424},
 }
+
+@article{Johannesma1981,
+  title={The phonochrome: a coherent spectro-temporal representation of sound.},
+  author={Peter Johannesma and Ad Aertsen and Bert Cranen and Leon van Erning},
+  journal={Hearing Research},
+  volume={5},
+  pages={123--145},
+  year={1981},
+}
+
+@article{Eggermont1983,
+  title={Reverse-correlation methods in auditory research.},
+  author={J. J. Eggermont and P. I. M. Johannesma and A. M. H. J. Aertsen},
+  journal={Quarterly Reviews of Biophysics},
+  volume={16},
+  number={3},
+  pages={341--414},
+  year={1983},
+}
+
+@article{Aertsen1981,
+  title={A comparison of the spectro-temporal sensitivity of neurons to tonal and natural stimuli.},
+  author={A. M. H. J. Aertsen and P. I. M. Johannesma},
+  journal={Biol. Cybern.},
+  volume={42},
+  pages={145--156},
+  year={1981},
+}