TY  - JOUR
AU  - Niemelä, Lassi
TI  - On the directability of automata
JO  - Kybernetika
PY  - 1989
SP  - 419
EP  - 421
VL  - 25
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/KYB_1989__25_5_a6/
LA  - en
ID  - KYB_1989__25_5_a6
ER  -