TY  - JOUR
AU  - Helfenstein, H. G.
AU  - Katz, E.
TI  - Intermediate flexibility of surfaces
JO  - Compositio Mathematica
PY  - 1972
SP  - 71
EP  - 78
VL  - 25
IS  - 1
PB  - Wolters-Noordhoff Publishing
UR  - http://www.numdam.org/item/CM_1972__25_1_71_0/
LA  - en
ID  - CM_1972__25_1_71_0
ER  -