Rigidity theory and applications / ed. by M.F. Thorpe and P.M. DuxburyNominal rigidities and the inflation-output trade-off / Victoria Caroline HoogenveenParkinsonian rigidity : analysis and quantification of EMG for use in stereotactic neurosurgery in Parkinson's disease / Alida Annechien Jacobi-PostmaOver rigiditeit = On rigidity / Bert Tellegen