Revisiting the birth locations of pulsars B1929+10, B2020+28, and B2021+51 Franz Kirsten, Wouter Vlemmings, Robert M. Campbell, Michael Kramer and Shami Chatterjee A&A, 577 (2015) A111 Published online: 13 May 2015 DOI: 10.1051/0004-6361/201425562