TY  - JOUR
AU  - D'Alessandro, Flavio
AU  - Varricchio, Stefano
TI  - Well quasi-orders, unavoidable sets, and derivation systems
JO  - RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
PY  - 2006
SP  - 407
EP  - 426
VL  - 40
IS  - 3
PB  - EDP-Sciences
UR  - http://www.numdam.org/articles/10.1051/ita:2006019/
DO  - 10.1051/ita:2006019
LA  - en
ID  - ITA_2006__40_3_407_0
ER  -