TY - JOUR AU - Kwara Nantomah TI - Monotonicity and convexity properties of the Nielsen's $\beta$-function JO - Problemy analiza PY - 2017 SP - 81 EP - 93 VL - 6 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/PA_2017_6_2_a4/ LA - en ID - PA_2017_6_2_a4 ER -