TY  - JOUR
AU  - Barr, Michael
AU  - Wells, Charles
TI  - On the Limitations of Sketches
JO  - Canadian mathematical bulletin
PY  - 1992
SP  - 287
EP  - 294
VL  - 35
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1992-040-7/
DO  - 10.4153/CMB-1992-040-7
ID  - 10_4153_CMB_1992_040_7
ER  -