TY  - JOUR
AU  - Xingru Zhang
TI  - Nonintegral boundary-slopes exist
JO  - Fundamenta Mathematicae
PY  - 1991
SP  - 219
EP  - 224
VL  - 138
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-138-3-219-224/
DO  - 10.4064/fm-138-3-219-224
LA  - en
ID  - 10_4064_fm_138_3_219_224
ER  -