@article{_azarski_2016, author = "R. \Lazarski and A. M. Burow and L. Grajciar and M. Sierka", title = "Density functional theory for molecular and periodic systems using density fitting and continuous fast multipole method: Analytical gradients", year = 2016, journal = "Journal of Computational Chemistry", publisher = "Wiley", volume = 37, number = 28, month = "Aug", doi = "10.1002/jcc.24477", url = "https://doi.org/10.1002%2Fjcc.24477" }