APA (7th ed.) Citation

Gerhardt, C. (2009). Quantum cosmological Friedman models with an initial singularity. Classical and quantum gravity, 26(1), . https://doi.org/10.1088/0264-9381/26/1/015001

Chicago Style (17th ed.) Citation

Gerhardt, Claus. "Quantum Cosmological Friedman Models with an Initial Singularity." Classical and Quantum Gravity 26, no. 1 (2009). https://doi.org/10.1088/0264-9381/26/1/015001.

MLA (9th ed.) Citation

Gerhardt, Claus. "Quantum Cosmological Friedman Models with an Initial Singularity." Classical and Quantum Gravity, vol. 26, no. 1, 2009, https://doi.org/10.1088/0264-9381/26/1/015001.