TY  - JOUR
AU  - Szepietowski, A.
TI  - There is no complete axiom system for shuffle expressions
JO  - RAIRO. Theoretical Informatics and Applications
PY  - 1999
SP  - 271
EP  - 277
VL  - 33
IS  - 3
PB  - EDP-Sciences
UR  - https://www.numdam.org/item/ITA_1999__33_3_271_0/
LA  - en
ID  - ITA_1999__33_3_271_0
ER  -