Thorne, Kip; Żytkow, Anna (March 1977). “Stars with degenerate neutron cores. I - Structure of equilibrium models”. The Astrophysical Journal212 (1): 832–858. Bibcode: 1977ApJ...212..832T. doi:10.1086/155109.
Vanture, Andrew; Zucker, Daniel; Wallerstein, George (April 1999). “U Aquarii a Thorne–Żytkow Object?”. The Astrophysical Journal514 (2): 932–938. Bibcode: 1999ApJ...514..932V. doi:10.1086/306956.
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Cannon, Robert; Eggleton, Peter; Żytkow, Anna; Podsialowsky, Philip (February 1992). “The structure and evolution of Thorne-Zytkow objects”. Astrophysical Journal386 (1): 206–214. Bibcode: 1992ApJ...386..206C. doi:10.1086/171006.
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Thorne, Kip; Żytkow, Anna (March 1977). “Stars with degenerate neutron cores. I - Structure of equilibrium models”. The Astrophysical Journal212 (1): 832–858. Bibcode: 1977ApJ...212..832T. doi:10.1086/155109.
Vanture, Andrew; Zucker, Daniel; Wallerstein, George (April 1999). “U Aquarii a Thorne–Żytkow Object?”. The Astrophysical Journal514 (2): 932–938. Bibcode: 1999ApJ...514..932V. doi:10.1086/306956.