APA (7th ed.) Citation

Steffen, M., & Ludwig, H. (1990). Results from 2-D numerical simulations of solar granules. Solar photosphere.

Chicago Style (17th ed.) Citation

Steffen, Matthias, and Hans-Günter Ludwig. "Results from 2-D Numerical Simulations of Solar Granules." Solar Photosphere 1990.

MLA (9th ed.) Citation

Steffen, Matthias, and Hans-Günter Ludwig. "Results from 2-D Numerical Simulations of Solar Granules." Solar Photosphere, 1990.

Warning: These citations may not always be 100% accurate.