Planer-Friedrich, LisaLisaPlaner-FriedrichSahm, MarcoMarcoSahm0000-0002-6528-65512026-01-272026-01-2720191617-71340931-8658https://fis.uni-bamberg.de/handle/uniba/112743engStrategic corporate social responsibility, imperfect competition, and market concentrationarticle10.1007/s00712-019-00663-xhttp://link.springer.com/content/pdf/10.1007/s00712-019-00663-x.pdf