(англ.)Kiefer, Walter S. (30-05-2004). Gravity evidence for an extinct magma chamber beneath Syrtis Major, Mars: a look at the magmatic plumbing system. Earth and Planetary Science Letters. 222 (2): 349—361. Bibcode:2004E&PSL.222..349K. doi:10.1016/j.epsl.2004.03.009.
(англ.)Kiefer, Walter S. (30-05-2004). Gravity evidence for an extinct magma chamber beneath Syrtis Major, Mars: a look at the magmatic plumbing system. Earth and Planetary Science Letters. 222 (2): 349—361. Bibcode:2004E&PSL.222..349K. doi:10.1016/j.epsl.2004.03.009.