แหล่งที่มา WikiPedia: PSR B1257+12 C http://adsabs.harvard.edu/abs/1992Natur.355..145W http://adsabs.harvard.edu/abs/2003ApJ...591L.147K http://www.astro.psu.edu/users/alex/pulsar_planets... http://exoplanet.eu/planet.php?p1=PSR+1257%2B12&p2... http://simbad.u-strasbg.fr/simbad/sim-id?Ident=PSR... http://www.extrasolar.net/planettour.asp?StarCatId... //arxiv.org/abs/astro-ph/0305536 //doi.org/10.1038%2F355145a0 //doi.org/10.1086%2F377093 http://www.iop.org/EJ/article/1538-4357/591/2/L147...
