WIP hardness, friction

references.bib

@@ -2378,3 +2378,119 @@
   pages = {401--408},
   doi = {10/cbxns3}
 }
+
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+}
+
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+@article{adams2013finger,
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+}
+
+@article{derler2013stick,
+  title = {Stick–Slip Phenomena in the Friction of Human Skin},
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+  date = {2013},
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+  volume = {301},
+  number = {1-2},
+  pages = {324--329},
+  doi = {10/f45z4n}
+}
+
+@article{messaoud2016relation,
+  title = {Relation between Human Perceived Friction and Finger Friction Characteristics},
+  author = {Messaoud, Wael Ben and Bueno, Marie-Ange and Lemaire-Semail, Betty},
+  date = {2016},
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+  doi = {10/f8nr2s}
+}