@article{articleaa03753f,
title   = {Parsec-scale jet precession in BL Lacertae (2200+420)},
author = {Caproni, A and Abraham, Zulema and Monteiro, H},
year = {2013},
doi = {10.1093/mnras/sts014},
journal   = {Monthly Notices of the Royal Astronomical Society}
}