APA (7th ed.) Citation

Reuter, M., & Wetterich, C. (1987). Time evolution of the cosmological “constant”. Physics letters, 188(1), . https://doi.org/10.1016/0370-2693(87)90702-7

Chicago Style (17th ed.) Citation

Reuter, Martin, and Christof Wetterich. "Time Evolution of the Cosmological “constant”." Physics Letters 188, no. 1 (1987). https://doi.org/10.1016/0370-2693(87)90702-7.

MLA (9th ed.) Citation

Reuter, Martin, and Christof Wetterich. "Time Evolution of the Cosmological “constant”." Physics Letters, vol. 188, no. 1, 1987, https://doi.org/10.1016/0370-2693(87)90702-7.