@article{Mueller:2011:Circ,
    author = {Thomas M{\"u}ller and Sebastian Boblest},
    title = {Visualizing circular motion around a Schwarzschild black hole},
    year = {2011},
    journal = {American Journal of Physics},
    volume = {79},
    number = {1},
    pages = {63-73},
    url = {http://link.aip.org/link/?AJP/79/63/1},
    doi = {10.1119/1.3492722}
}