add missing DOIs

paper/paper.bib

@@ -9,6 +9,7 @@ @article{sparse:2011
  author = {{Davis}, T. A. and {Hu}, Y.},
  title = {The University of Florida sparse matrix collection},
  journal = {ACM Transactions on Mathematical Software (TOMS), 38(1), 1-25},
+ doi = {10.1145/2049662.2049663},
  year = 2016
 }
 
@@ -23,6 +24,7 @@ @article{symare:2013
  author = {Jin, C. T. and Guillon, P. and Epain, N. and Zolfaghari, R. and Van Schaik, A. and Tew, A. I. and  Thorpe, J.},
  title = {Creating the Sydney York morphological and acoustic recordings of ears database},
  journal = {IEEE Transactions on Multimedia, 16(1), 37-46},
+ doi = {10.1109/icme.2012.93},
  year = 2013
 }
 
@@ -37,6 +39,7 @@ @article{vtk:2000
   author = {Schroeder, W. J. and Avila, L. S. and Hoffman, W.},
   title = {Visualizing with VTK: a tutorial},
   year = {2000},
+  doi = {10.1109/38.865875},
   journal = {IEEE Computer graphics and applications, 20(5), 20-27},
 }