AIDA BANI, DOLJA PAVLOVA, GUILLAUME ECHEVARRIA, ALFRED MULLAJ, ROGER D. REEVES5, JEAN LOUIS MOREL & SULEJMAN SULÇE (2010) Nickel hyperaccumulation by the species of Alyssum and Thlaspi (Brassicaceae) from the ultramafi c soils of the Balkans – Botanica Serbica 34(1): 3-14