deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index 7825c95..8991a6c 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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address = {Cambridge},  year = {1998},  }  @article{Malakis_1976,  doi = {10.1088/0305-4470/9/8/018},  url = {http://dx.doi.org/10.1088/0305-4470/9/8/018},  year = {1976},  month = {Aug},  publisher = {IOP Publishing},  volume = {9},  number = {8},  pages = {1283-1291},  author = {A Malakis},  title = {{The trail problem on the square lattice}},  journal = {Journal of Physics A: Mathematical and General},  }