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Madrid, Juan P., Sparks, William B., Harris, D. E., Perlman, Eric S., Macchetto, Duccio, and Biretta, John. 2007. "Deep Hubble space telescope ultraviolet imaging of the M87 jet." Astrophysics and Space Science, 311 329–333. https://doi.org/10.1007/s10509-007-9528-2.