update literature

amu-literature.bib

@@ -1234,6 +1234,32 @@
   groups  = {evaluation},
 }
 
+@Article{evert2017understanding,
+  author    = {Evert, Stefan and Proisl, Thomas and Jannidis, Fotis and Reger, Isabella and Pielstr{\"o}m, Steffen and Sch{\"o}ch, Christof and Vitt, Thorsten},
+  journal   = {Digital Scholarship in the Humanities},
+  title     = {Understanding and explaining Delta measures for authorship attribution},
+  year      = {2017},
+  number    = {suppl\_2},
+  pages     = {ii4--ii16},
+  volume    = {32},
+  file      = {:fqx023.pdf:PDF},
+  groups    = {comparison-literary-texts},
+  publisher = {Oxford University Press},
+}
+
+@Article{koppel2014determining,
+  author    = {Koppel, Moshe and Winter, Yaron},
+  journal   = {Journal of the Association for Information Science and Technology},
+  title     = {Determining if two documents are written by the same author},
+  year      = {2014},
+  number    = {1},
+  pages     = {178--187},
+  volume    = {65},
+  file      = {:computationalstylistics.github.io_docs_imposters.pdf:PDF;:Determining-If-Two-Documents-Are-Written-by-the-Same-Author.pdf:PDF},
+  groups    = {comparison-literary-texts},
+  publisher = {Wiley Online Library},
+}
+
 @Comment{jabref-meta: databaseType:bibtex;}
 
 @Comment{jabref-meta: grouping: