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WikiPedia: PSR_B1257+12 http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CS... http://www.hpcf.upr.edu/~abel/phl/hec_plots/hec_or... http://simbad.u-strasbg.fr/simbad/sim-id?Ident=PSR... http://www.phy.cuhk.edu.hk/opus/comments_2011/hckr... http://mnras.oxfordjournals.org/content/early/2013...