TY  - JOUR
AU  - Zvonimir Janko
AU  - Tran van Trung
TI  - On Projective Planes of Order Twelve and Twenty.
JO  - Mathematische Zeitschrift
PY  - 1980
SP  - 199
EP  - 202
VL  - 173
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1980__173_172980/
ID  - MZ_1980__173_172980
ER  -