Feigelson, E. D.; Decampli, W. M. (1981). "Observations of X-ray emission from T Tauri stars". Astrophysical Journal Letters. 243: L89 –L93. Bibcode:1981ApJ...243L..89F. doi:10.1086/183449.
Montmerle, T. (1983). "Einstein observations of the Rho Ophiuchi dark cloud - an X-ray Christmas tree". Astrophysical Journal, Part 1. 269: 182–201. Bibcode:1983ApJ...269..182M. doi:10.1086/161029.
Feigelson, E. D.; Decampli, W. M. (1981). "Observations of X-ray emission from T Tauri stars". Astrophysical Journal Letters. 243: L89 –L93. Bibcode:1981ApJ...243L..89F. doi:10.1086/183449.
Montmerle, T. (1983). "Einstein observations of the Rho Ophiuchi dark cloud - an X-ray Christmas tree". Astrophysical Journal, Part 1. 269: 182–201. Bibcode:1983ApJ...269..182M. doi:10.1086/161029.