@unpublished{baker:hal-02337080,
TITLE = {All Known Principal Congruence Links},
AUTHOR = {Baker, Mark D. and Goerner, Matthias and Reid, Alan W.},
URL = {https://hal.science/hal-02337080},
NOTE = {9 pages, 16 figures},
YEAR = {2019},
MONTH = Oct, HAL_ID = {hal-02337080},
HAL_VERSION = {v1},
}