TY  - JOUR
AU  - Rival, Ivan
AU  - Sands, Bill
TI  - Planar Sublattices of a Free Lattice. II
JO  - Canadian journal of mathematics
PY  - 1979
SP  - 17
EP  - 34
VL  - 31
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-003-8/
DO  - 10.4153/CJM-1979-003-8
ID  - 10_4153_CJM_1979_003_8
ER  -