Ertan, Ü; Erkut, M. H.; Ekşi, K. Y.; Alpar, M. A. (March 2007). «The Anomalous X-Ray Pulsar 4U 0142+61: A Neutron Star with a Gaseous Fallback Disk». The Astrophysical Journal657 (1): 441–447. doi:10.1086/510303. Bibcode: 2007ApJ...657..441E.
Ertan, Ü; Erkut, M. H.; Ekşi, K. Y.; Alpar, M. A. (March 2007). «The Anomalous X-Ray Pulsar 4U 0142+61: A Neutron Star with a Gaseous Fallback Disk». The Astrophysical Journal657 (1): 441–447. doi:10.1086/510303. Bibcode: 2007ApJ...657..441E.