Add bib file

org/ref.bib

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+@book{taghirad13_paral,
+  author = {Taghirad, Hamid},
+  title = {Parallel robots : mechanics and control},
+  year = {2013},
+  publisher = {CRC Press},
+  address = {Boca Raton, FL},
+  isbn = {9781466555778},
+  tags = {favorite, parallel robot},
+}
+
+@book{preumont18_vibrat_contr_activ_struc_fourt_edition,
+  author = {Andre Preumont},
+  title = {Vibration Control of Active Structures - Fourth Edition},
+  year = {2018},
+  publisher = {Springer International Publishing},
+  url = {https://doi.org/10.1007/978-3-319-72296-2},
+  doi = {10.1007/978-3-319-72296-2},
+  pages = {nil},
+  series = {Solid Mechanics and Its Applications},
+  tags = {favorite, parallel robot},
+}
+
+@book{skogestad07_multiv_feedb_contr,
+  author = {Skogestad, Sigurd and Postlethwaite, Ian},
+  title = {Multivariable Feedback Control: Analysis and Design},
+  year = {2007},
+  publisher = {John Wiley},
+  isbn = {9780470011683},
+  tags = {favorite},
+}