TY  - JOUR
AU  - R.M. Brooks
TI  - Boundaries for Natural Systems II.
JO  - Mathematica Scandinavica
PY  - 1972
SP  - 281
EP  - 289
VL  - 30
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1972__30_166243/
ID  - MS2_1972__30_166243
ER  -