@unpublished{baker:hal-02337089,
TITLE = {Technical Report: All Principal Congruence Link Groups},
AUTHOR = {Baker, Mark D. and Goerner, Matthias and Reid, Alan W.},
URL = {https://hal.science/hal-02337089},
NOTE = {60 pages, 31 tables, 15 figures},
YEAR = {2019},
MONTH = Oct, HAL_ID = {hal-02337089},
HAL_VERSION = {v1},
}