%0 Journal Article %A Grätzer, G. %A Lakser, H. %T Homomorphisms of Distributive Lattices as Restrictions of Congruences. II. Planarity and Automorphisms %J Canadian journal of mathematics %D 1994 %P 3-54 %V 46 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1994-001-7/ %R 10.4153/CJM-1994-001-7 %F 10_4153_CJM_1994_001_7