@ARTICLE{
author={Krivoshiev Stefan,Wizemann Volker,Czekalski Stanisaw,Schiller Adalbert,Pljesa Steva J,Wolf-Pflugmann Michael,Siebert-Weigel Marianne,Koytchev Rossen,Bronn Angelika},
year={2010},
title={Therapeutic equivalence of epoetin zeta and alfa, administered subcutaneously, for maintenance treatment of renal anemia},
journal={ADVANCES IN THERAPY},
volume={27},
number={2},
pages={105-117},
document_type={Article},
} 

@ARTICLE{
author={Tzekova Valentina,Mihaylov Georgi,Elezovic Ivo V,Koytchev Rossen},
year={2009},
title={Therapeutic effects of epoetin zeta in the treatment of chemotherapy-induced anaemia},
journal={CURRENT MEDICAL RESEARCH AND OPINION},
volume={25},
number={7},
pages={1689-1697},
document_type={Proceedings Paper},
}