Pol, N., McLaughlin, M., Kramer, M., Stairs, I., Perera, B., & Possenti, A. (2018). A Direct Measurement of Sense of Rotation of PSR J0737 -- 3039A. Astrophysical Journal, 853: 73, pp. 73. doi:10.3847/1538-4357/aaa1a0.