WIP related work

references.bib

@@ -1450,6 +1450,16 @@
   doi = {10/gm5m8d}
 }
 
+@article{higashi2019hardness,
+  title = {Hardness {{Perception Based}} on {{Dynamic Stiffness}} in {{Tapping}}},
+  author = {Higashi, Kosuke and Okamoto, Shogo and Yamada, Yoji and Nagano, Hikaru and Konyo, Masashi},
+  date = {2019},
+  journaltitle = {Front. Psychol.},
+  volume = {9},
+  pages = {2654},
+  doi = {10/gs4tmg}
+}
+
 @inproceedings{hilliges2012holodesk,
   title = {{{HoloDesk}}: Direct 3d Interactions with a Situated See-through Display},
   shorttitle = {{{HoloDesk}}},