TY  - JOUR
AU  - Anders Kock
AU  - Gonzalo E. Reyes
TI  - Some calculus with extensive quantities:  
wave equation
JO  - Theory and applications of categories
PY  - 2003
SP  - 321
EP  - 336
VL  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TAC_2003_11_a13/
LA  - en
ID  - TAC_2003_11_a13
ER  -