fixed double entries

collab.bib

@@ -98,16 +98,6 @@
   series = {ICALEPCS '13}
 }
 
-@inproceedings{vogelgesang2013concert,
-  author    = {Vogelgesang, M. and Farago, T. and Rolo, T.d. and Kopmann, A.
-               and Baumbach, T.},
-  booktitle = {Proceedings of the 14th International Conference on Accelerator
-               \& Large Experimental Physics Control Systems},
-  series    = {ICALEPCS '13},
-  title     = {When Hardware and Software Work in Concert},
-  year      = {2013},
-}
-
 @inproceedings{yang2013algebraic,
   author    = {Yang, H. and Jejkal, T. and Stotzka, R. and Pasic, and dos
       Santos Rolo, T.},
@@ -228,15 +218,6 @@
   year = {2013}
 }
 
-@MISC{vandekamp2013invivo,
-  author = {van de Kamp, T. and dos Santos Rolo, T. and Ershov, A. and Baumbach, T.},
-  title = {n vivo X-ray 4D cine-tomography
-  for tracking morphological dynamics in insects},
-  howpublished = {Entomology 2013},
-  month = {11},
-  year = {2013}
-}
-
 @MISC{vandekamp2013vompr,
   author = {van de Kamp, T. and Baumbach, T.},
   title = {Vom Pr{\"a}parat zum Kunststoffmodell: 3D-Druck f{\"u}ur Morphologen},
@@ -298,7 +279,7 @@
   year = {2013}
 }
 
-@MISC{yang2013algebraic,
+@MISC{yang2013algebraictalk,
   author = {Yang, X.},
   title = {Algebraic Reconstruction of X-ray Tomography on Parallel Computing
       Architecture of LSDF},
@@ -883,7 +864,7 @@
   year = {2010}
 }
 
-@MISC{vandekamp2010insect,
+@MISC{vandekamp2010insectxtop,
   author = {van de Kamp, T. and dos Santos Rolo, T. and Riedel, A. and Greven,
       H. and Baumbach, T.},
   title = { Insect tomography at {ANKA}: applications and visualization},