@article{Haug, author = {Haug, Sonja}, title = {Die Migration aus Polen gewinnt an Bedeutung}, series = {BiB-Mitteilungen}, volume = {23}, journal = {BiB-Mitteilungen}, number = {4}, pages = {10 -- 18}, language = {de} } @article{Haug, author = {Haug, Sonja}, title = {Trends der Auswanderung aus Deutschland}, series = {BiB-Mitteilungen}, volume = {25}, journal = {BiB-Mitteilungen}, number = {1}, pages = {11 -- 14}, language = {de} }