diff --git a/resources/mei_bibliography.bib b/resources/mei_bibliography.bib
index ce627dca..f9f3ea74 100644
--- a/resources/mei_bibliography.bib
+++ b/resources/mei_bibliography.bib
@@ -1,6 +1,6 @@
 % This file was created with Citavi 6.1.0.0
 % created 2018-05-05
-% modified 2018-06-06
+% modified 2018-06-22
 
 @inproceedings{Bell_2016,
  abstract = {Conductor copies of musical scores are typically rich in handwritten annotations. Ongoing archival efforts to digitize orchestral conductors' scores have made scanned copies of hundreds of these annotated scores available in digital formats.
@@ -22,8 +22,19 @@ @inproceedings{Bell_2016
  booktitle = {DLfM 2016. Proceedings of the 3rd International Workshop on Digital Libraries for Musicology},
  year = {2016},
  address = {New York, NY},
- doi = {10.1145/2970044.2970053},
- url = {http://delivery.acm.org/10.1145/2980000/2970053/p33-bell.pdf}
+ doi = {10.1145/2970044.2970053}
+}
+
+
+@article{Bohl_2011,
+ abstract = {},
+ author = {Bohl, Benjamin and Kepper, Johannes and Röwenstrunk, Daniel},
+ year = {2011},
+ title = {Perspektiven digitaler Musikeditionen aus der Sicht des Edirom-Projekts},
+ pages = {270–276},
+ volume = {5},
+ number = {3},
+ journal = {Die Tonkunst: Magazin f{\"u}r Klassische Musik und Musikwissenschaft}
 }
 
 
@@ -126,8 +137,7 @@ @inproceedings{Devaney_2016
  booktitle = {DLfM 2016. Proceedings of the 3rd International Workshop on Digital Libraries for Musicology},
  year = {2016},
  address = {New York, NY},
- doi = {10.1145/2970044.2970052},
- url = {http://delivery.acm.org/10.1145/2980000/2970052/p1-devaney.pdf}
+ doi = {10.1145/2970044.2970052}
 }
 
 
@@ -213,7 +223,6 @@ @inproceedings{Hankinson_2012
  abstract = {In this paper we present our work towards developing a largescale web application for digitizing, recognizing (via optical music recognition), correcting, displaying, and searching printed music texts. We present the results of a recently completed prototype implementation of our workflow process, from document capture to presentation on the web. We discuss a number of lessons learned from this prototype. Finally, we present some open-source Web 2.0 tools developed to provide essential infrastructure components for making searchable printed music collections available online. Our hope is that these experiences and tools will help in creating next-generation globally accessible digital music libraries.},
  author = {Hankinson, Andrew and Burgoyne, John Ashley and Vigliensoni, Gabriel and Fujinaga, Ichiro},
  title = {Creating a Large-Scale Searchable Digital Collection from Printed Music Materials},
- url = {https://dl.acm.org/citation.cfm?id=2188221},
  pages = {903–908},
  publisher = {{Association for Computing Machinery}},
  booktitle = {WWW'12. Proceedings of the 21st International Conference Companion on World Wide Web},
@@ -323,8 +332,7 @@ @inproceedings{Laplante_2016
  booktitle = {DLfM 2016. Proceedings of the 3rd International Workshop on Digital Libraries for Musicology},
  year = {2016},
  address = {New York, NY},
- doi = {10.1145/2970044.2970055},
- url = {http://delivery.acm.org/10.1145/2980000/2970055/p45-laplante.pdf}
+ doi = {10.1145/2970044.2970055}
 }
 
 
@@ -390,8 +398,7 @@ @article{McAulay_2016
  number = {7},
  issn = {0950-4125},
  journal = {Reference Reviews},
- doi = {10.1108/RR-03-2015-0073},
- url = {https://www.emeraldinsight.com/doi/pdfplus/10.1108/RR-03-2015-0073}
+ doi = {10.1108/RR-03-2015-0073}
 }
 
 
@@ -513,8 +520,7 @@ @inproceedings{Rizo_2016
  booktitle = {DLfM 2016. Proceedings of the 3rd International Workshop on Digital Libraries for Musicology},
  year = {2016},
  address = {New York, NY},
- doi = {10.1145/2970044.2970046},
- url = {http://delivery.acm.org/10.1145/2980000/2970046/p25-rizo.pdf}
+ doi = {10.1145/2970044.2970046}
 }
 
 
@@ -634,7 +640,6 @@ @article{Roland_2014
  volume = {42},
  number = {4},
  journal = {Early Music},
- url_Link = {http://em.oxfordjournals.org/content/42/4/605.full.pdf+html},
  doi = {10.1093/em/cau098}
 }
 
@@ -674,7 +679,7 @@ @misc{Schraeder_2007
  title = {{Ein XML-Datenformat zur Repr{\"a}sentation kritischer Musikedition unter besonderer Ber{\"u}cksichtigung von Neumennotation}},
  url = {http://www.dimused.uni-tuebingen.de/downloads/studienarbeit.pdf},
  note = {{Seminar Paper. T{\"u}bingen, Eberhard Karls Universit{\"a}t}},
- 
+
 }
 
 
@@ -708,7 +713,6 @@ @article{Stinson_2014
  author = {Stinson, John and Stoessel, Jason},
  year = {2014},
  title = {Encoding Medieval Music Notation for Research},
- url_Link = {http://em.oxfordjournals.org/content/42/4/613.full.pdf+html},
  pages = {613–617},
  volume = {42},
  number = {4},
@@ -794,8 +798,7 @@ @inproceedings{Viglianti_2016
  booktitle = {DLfM 2016. Proceedings of the 3rd International Workshop on Digital Libraries for Musicology},
  year = {2016},
  address = {New York, NY},
- doi = {10.1145/2970044.2970056},
- url = {http://delivery.acm.org/10.1145/2980000/2970056/p57-viglianti.pdf}
+ doi = {10.1145/2970044.2970056}
 }
 
 
@@ -851,5 +854,3 @@ @inproceedings{Zitellini_2016
  year = {2016},
  address = {Cambridge, UK}
 }
-
-