TY  - JOUR
AU  - Donald J. Collins
AU  - Zieschang Heiner
TI  - Rescuing the Whitehead Method for Free Products, I: Peak Reduction.
JO  - Mathematische Zeitschrift
PY  - 1984
SP  - 487
EP  - 504
VL  - 185
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1984__185_173416/
ID  - MZ_1984__185_173416
ER  -