Update cittation.bib

Author: Mantas Mikaitis

citation.bib

@@ -12,16 +12,13 @@ @techreport{himi21a
   url = "http://eprints.maths.manchester.ac.uk/2834/"
 }
 
-@techreport{himi21b,
+@article{himi21b,
   author = "Nicholas J. Higham and Mantas Mikaitis",
   title = "Anymatrix: {An} Extensible {MATLAB} Matrix Collection",
-  institution =  "Manchester Institute for Mathematical
-                  Sciences, The University of Manchester",
-  address = "UK",
-  type = "{MIMS EPrint}".
-  number = "2021.16",
-  pages = "20",
-  month = oct,
+  journal = "Numer. Algorithms",
+  volume = "",
+  number = "",
+  pages = "",
   year = 2021,
-  url = "http://eprints.maths.manchester.ac.uk/2835/"
+  doi = "10.1007/s11075-021-01226-2"
 }