2. Citing HORTON

In anticipation of the first announcement of HORTON in a scientific journal, please refer to HORTON as follows:

Toon Verstraelen, Pawel Tecmer, Farnaz Heidar-Zadeh, Katharina Boguslawski, Matthew Chan, Yilin Zhao, Taewon D. Kim, Steven Vandenbrande, Derrick Yang, Cristina E. González-Espinoza, Stijn Fias, Peter A. Limacher, Diego Berrocal, Ali Malek, Paul W. Ayers HORTON 2.1.0b1, http://theochem.github.com/horton/, 2015