A. Jacqueline, H. Maria, L. Yianna, L. Gunnar, L. Annina, P. Eija, R. Cath
/, Article (sc. journal)
THE WORLD BANK
2008, Article (sc. journal)
Dr. Norbert Reintjes, PAN Germany
/, Article (sc. journal)
N. Xu and M. Fok
2010, Article (sc. journal)
M. Fok and N. Xu
2010, Article (sc. journal)