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Multilingual
1
Gerhardt, B. R., | Warren, Gorham and Lamont | 2005 ,
2
Gerhardt, Philipp, 475-G368m | Jossey-Bass Publishers | 1994 475-G368m,
3
Forstmann, F., 429.1-F733m | Springer-Verlag Berlin Heidelberg | 1986 429.1-F733m,