TY  - JOUR
AU  - Arto Salomaa
TI  - On essential variables of functions, especially in the algebra of logic
JO  - Annales Fennici Mathematici
PY  - 1964
VL  - 336-344
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1964.339/
DO  - 10.5186/aasfm.1964.339
LA  - en
ID  - AFM_1964_336-344_a5
ER  -