Ref1

https://s3.amazonaws.com/academia.edu.documents/45998500/s0167-8809_2899_2900096-120160527-6896-e7ow2.pdf?AWSAccessKeyId=AKIAIWOWYYGZ2Y53UL3A&Expires=1541580139&Signature=WI2MyQimpW%2BCVG8YBUe7ZaawtsY%3D&response-content-disposition=inline%3B%20filename%3DSpecies_diversity_as_a_task_for_organic.pdf