APA (7th ed.) Citation

Kvaal, S., Ekström, U., Teale, A. M., & Helgaker, T. (2014). Differentiable but exact formulation of density-functional theory. American Institute of Physics.

Chicago Style (17th ed.) Citation

Kvaal, Simen, Ulf Ekström, Andrew M. Teale, and Trygve Helgaker. Differentiable but Exact Formulation of Density-functional Theory. American Institute of Physics, 2014.

MLA (9th ed.) Citation

Kvaal, Simen, et al. Differentiable but Exact Formulation of Density-functional Theory. American Institute of Physics, 2014.