Added MNIST reference

Signed-off-by: Jim Martens <github@2martens.de>

ma.bib

@@ -712,4 +712,19 @@ to construct explicit models for non-normal classes. Application includes infere
   timestamp = {2019.07.30},
 }
 
+@Article{Deng2012,
+  author    = {Li Deng},
+  title     = {The {MNIST} Database of Handwritten Digit Images for Machine Learning Research [Best of the Web]},
+  journal   = {{IEEE} Signal Processing Magazine},
+  year      = {2012},
+  volume    = {29},
+  number    = {6},
+  pages     = {141--142},
+  doi       = {10.1109/msp.2012.2211477},
+  abstract  = {In this issue, “Best of the Web” presents the modified National Institute of Standards and Technology (MNIST) resources, consisting of a collection of handwritten digit images used extensively in optical character recognition and machine learning research.},
+  owner     = {jim},
+  publisher = {Institute of Electrical and Electronics Engineers ({IEEE})},
+  timestamp = {2019.08.13},
+}
+
 @Comment{jabref-meta: databaseType:biblatex;}