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-Zitierstil (17. Ausg.)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-Zitierstil (9. Ausg.)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.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.