author = { Lallemand, Thierry AND Rycx, François },

title = { Are Older Workers Harmful for Firm Productivity? },

publisher = {Springer Science and Business Media LLC},

isbn = {0013-063X},

isbn = {1572-9982},

year = {2009},

url = { http://slubdd.de/katalog?TN_libero_mab2 }