Rathbun, J. A.; Spencer, J.R.; Tamppari, L.K.; Martin, T.Z.; Barnard, L.; Travis, L.D. (2004). "Mapping of Io's thermal radiation by the Galileo photopolarimeter-radiometer (PPR) instrument". Icarus. 169 (1): 127–139. डीओआइ:10.1016/j.icarus.2003.12.021. बिबकोड:2004Icar..169..127R.
Lopes, R. M. C.; एवं अन्य (2004). "Lava lakes on Io: Observations of Io's volcanic activity from Galileo NIMS during the 2001 fly-bys". Icarus. 169 (1): 140–174. डीओआइ:10.1016/j.icarus.2003.11.013. बिबकोड:2004Icar..169..140L. Explicit use of et al. in: |author2= (मदद)
Rathbun, J. A.; Spencer, J.R.; Tamppari, L.K.; Martin, T.Z.; Barnard, L.; Travis, L.D. (2004). "Mapping of Io's thermal radiation by the Galileo photopolarimeter-radiometer (PPR) instrument". Icarus. 169 (1): 127–139. डीओआइ:10.1016/j.icarus.2003.12.021. बिबकोड:2004Icar..169..127R.
Lopes, R. M. C.; एवं अन्य (2004). "Lava lakes on Io: Observations of Io's volcanic activity from Galileo NIMS during the 2001 fly-bys". Icarus. 169 (1): 140–174. डीओआइ:10.1016/j.icarus.2003.11.013. बिबकोड:2004Icar..169..140L. Explicit use of et al. in: |author2= (मदद)