Add reference

nass-fem.bib

@@ -53,6 +53,19 @@
 
 
 
+@article{craig68_coupl_subst_dynam_analy,
+  author          = {ROY R. CRAIG and MERVYN C. C. BAMPTON},
+  title           = {Coupling of Substructures for Dynamic Analyses.},
+  journal         = {AIAA Journal},
+  volume          = 6,
+  number          = 7,
+  pages           = {1313-1319},
+  year            = 1968,
+  doi             = {10.2514/3.4741},
+  url             = {http://dx.doi.org/10.2514/3.4741},
+}
+
+
 @article{claeyssen07_amplif_piezoel_actuat,
   author          = {Frank Claeyssen and R. Le Letty and F. Barillot and O.
                   Sosnicki},

nass-fem.org

@@ -1190,7 +1190,7 @@ Procedure:
   - connect other parts
   - apply forces and torques
   - measure motion between frames
-- perform the modal reduction technique from FEA (also called component mode synthesis or "Craig-Bampton" method) for the reduction of the high number of FEA degrees of freedom (DoF) to a smaller number of retained degrees of freedom
+- perform the modal reduction technique from FEA (also called component mode synthesis or "Craig-Bampton" method [[cite:&craig68_coupl_subst_dynam_analy]]) for the reduction of the high number of FEA degrees of freedom (DoF) to a smaller number of retained degrees of freedom
   typically from hundred thousands to less than 100 DoF
 - the number of DoF is 6 times the number of defined frame + any number of additional DoF that we want to model
   $m = 6 \times n + p$