TY  - JOUR
AU  - Stephan Ruscheweyh
AU  - C. Luis Salinas
TI  - On the preservation of direction-convexity and the Goodman-Saff conjecture
JO  - Annales Fennici Mathematici
PY  - 1989
SP  - 63
EP  - 73
VL  - 14
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1989.1427/
DO  - 10.5186/aasfm.1989.1427
LA  - en
ID  - AFM_1989_14_1_a6
ER  -