Yan, Zhen; và đồng nghiệp (2013). “Very long baseline interferometry astrometry of PSR B1257+12, a pulsar with a planetary system”. Monthly Notices of the Royal Astronomical Society. 433 (1): 162–169. Bibcode:2013MNRAS.433..162Y. doi:10.1093/mnras/stt712.
Yan, Zhen; và đồng nghiệp (2013). “Very long baseline interferometry astrometry of PSR B1257+12, a pulsar with a planetary system”. Monthly Notices of the Royal Astronomical Society. 433 (1): 162–169. Bibcode:2013MNRAS.433..162Y. doi:10.1093/mnras/stt712.