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Publisher
- academic press2
- agr univ iceland, fac nat & environm sci, hvanneyri, iceland.5
- altai state univ, barnaul, russia.5
- american association for the advancement of science2
- arctic univ norway, dept arctic & marine biol, tromso, norway.5
- association des amis des cryptogames1
- biomed central4
- botswana int univ sci & technol, dept biol sci & biotechnol, palapye, botswana.5
- calif state polytech univ arcata, dept biol sci, arcata, ca usa.5