Synergy of novel coumarin derivatives and tamoxifen in blocking growth and inducing apoptosis of breast cancer cells oleh Lulzime Ballazhi, Faik Imeri, Aleksandar Dimovski, Ahmed Jashari, Emil Popovski, Pranvera Breznica-Selmani, Bozhana Mikhova, Gerald Dräger, Edita Alili-Idrizi, Kristina Mladenovska