Takahashi, Y., Kataoka, J., Niinuma, K., Honma, M., Inoue, Y., Totani, T., et al. (2013). X-Ray and Radio Follow-up Observations of High-redshift Blazar Candidates in the Fermi-LAT Unassociated Source Population. Astrophysical Journal, 773(1): 36. doi:10.1088/0004-637X/773/1/36.