@misc{VanRiiHarJylVeh16,
 author={Jarno Vanhatalo and Jaakko Riihimaki and Jouni Hartikainen and Pasi Jylanki and Ville Tolvanen and Aki Vehtari},
 title={GPstuff},
 year={2016},
 note={\url{http://mloss.org/software/view/451/}}
}