punctuation, appended state of the art

literatur.bib

@@ -1,4 +1,20 @@
 
+@article{elias1980,
+  title = {Accuracy and Performance Analysis of a Nuclear Belt Weigher},
+  author = {Elias, E. and Pieters, W. and Yom-tov, Z.},
+  date = {1980-12-01},
+  journaltitle = {Nuclear Instruments and Methods},
+  shortjournal = {Nuclear Instruments and Methods},
+  volume = {178},
+  number = {1},
+  pages = {109--115},
+  issn = {0029-554X},
+  doi = {10.1016/0029-554X(80)90863-0},
+  abstract = {Nuclear belt weighers have a broad range of applications in the solid particle industry. This work analyzes the accuracy and sensitivity of nuclear weighers for a wide range of operational conditions and design parameters. The problem of the effect of material profile and bulk density variations on the scale performance is quantitatively addressed. A new methodology is developed to calculate the minimum detectable load accounting for both accuracy and sensitivity. Accuracies of less than 1\% can be achieved in some ideal situations by proper design of the source length and geometrical configuration.},
+  langid = {english},
+  file = {/home/naresh/Zotero/storage/5MYVCG6T/Elias et al. - 1980 - Accuracy and performance analysis of a nuclear bel.pdf;/home/naresh/Zotero/storage/9HHFBGPZ/0029554X80908630.html}
+}
+
 @inproceedings{fojtik2014,
   title = {Measurement of the Volume of Material on the {{Conveyor Belt}} Measuring of the Volume of Wood Chips during Transport on the {{Conveyor Belt}} Using a Laser Scanning},
   booktitle = {Proceedings of the 2014 15th {{International Carpathian Control Conference}} ({{ICCC}})},