Helge Rottmann (27 May 2013). "Very long baseline interferometry astrometry of PSR B1257+12, a pulsar with a planetary system". Monthly Notices of the Royal Astronomical Society (بالإنجليزية). 433 (1): 162–169. Bibcode:2013MNRAS.433..162Y. DOI:10.1093/MNRAS/STT712. ISSN:0035-8711. QID:Q56443445.
Helge Rottmann (27 May 2013). "Very long baseline interferometry astrometry of PSR B1257+12, a pulsar with a planetary system". Monthly Notices of the Royal Astronomical Society (بالإنجليزية). 433 (1): 162–169. Bibcode:2013MNRAS.433..162Y. DOI:10.1093/MNRAS/STT712. ISSN:0035-8711. QID:Q56443445.
Helge Rottmann (27 May 2013). "Very long baseline interferometry astrometry of PSR B1257+12, a pulsar with a planetary system". Monthly Notices of the Royal Astronomical Society (بالإنجليزية). 433 (1): 162–169. Bibcode:2013MNRAS.433..162Y. DOI:10.1093/MNRAS/STT712. ISSN:0035-8711. QID:Q56443445.
Helge Rottmann (27 May 2013). "Very long baseline interferometry astrometry of PSR B1257+12, a pulsar with a planetary system". Monthly Notices of the Royal Astronomical Society (بالإنجليزية). 433 (1): 162–169. Bibcode:2013MNRAS.433..162Y. DOI:10.1093/MNRAS/STT712. ISSN:0035-8711. QID:Q56443445.