@article{alexandra2015investigating,
  title = {Investigating atmospheric photochemistry in the Johannesburg-Pretoria megacity using a box model}
  author = {Alexandra S.M. Lourens
Tim M. Butler
J. Paul Beukes
Pieter G. van Zyl
Gerhard D. Fourie
Mark G. Lawrence},
  url = {http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S0038-23532016000100025&lng=en&tlng=en},
  doi = {2015-0169},
  year = {2015}
}