deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index 8eaa59c..ca254c7 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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@article{Sperber_1958,  doi = {10.1071/ar9580778}, {10.1071/ar9580782},  url = {http://dx.doi.org/10.1071/ar9580778}, {http://dx.doi.org/10.1071/ar9580782},  year = {1958},  publisher = {{CSIRO} Publishing},  volume = {9},  number = {6},  pages = {778}, {782},  author = {JI Sperber},  title = {{The incidence {{Solution  of apatite-solubilizing organisms in the rhizosphere and soil}}, apatite by soil microorganisms producing organic acids}},  journal = {Aust. J. Agric. Res.},  }