TY  - JOUR
AU  - Masataka Tomari
AU  - Fumio Hidaka
TI  - On singularities arising from the contraction of the minimal section a a ruled surface.
JO  - Manuscripta mathematica
PY  - 1989
SP  - 329
EP  - 348
VL  - 65
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MM2_1989__65_3_155443/
ID  - MM2_1989__65_3_155443
ER  -