TY  - JOUR
AU  - Günther Wirsching
TI  - An improved estimate concerning 3n+1 predecessor sets
JO  - Acta Arithmetica
PY  - 1993
SP  - 205
EP  - 210
VL  - 63
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/aa-63-3-205-210/
DO  - 10.4064/aa-63-3-205-210
LA  - en
ID  - 10_4064_aa_63_3_205_210
ER  -