P. Flores, J. Ambrósio, Revolute joints with clearance in multibody systems, Computers & Structures, 82 (2004) 1359-1369.
 S. Dubowsky, F. Freudenstein, Dynamic analysis of mechanical systems with clearances, Part I: Formation of dynamic model, Journal of Engineering for Industry, (1971) 305–309.
 J. Rhee, A. Akay, Dynamic response of a revolute joint with clearance, Mechanism and Machine Theory, 31 (1996) 121-134.
 P. Ravn, A continuous analysis method for planar multibody systems with joint clearance, Multibody System Dynamics, 2 (1998) 1-24.
 A.L. Schwab, J.P. Meijaard, P. Meijers, A comparison of revolute joint clearance models in the dynamic analysis of rigid and elastic mechanical systems, Mechanism and Machine Theory, 37 (2002) 895-913.
 P. Flores, J. Ambrósio, J.P. Claro, Dynamic analysis for planar multibody mechanical systems with lubricated joints, Multibody System Dynamics, 12 (2004) 47-74.
 Q. Tian, Y. Zhang, L. Chen, P. Flores, Dynamics of spatial flexible multibody systems with clearance and lubricated spherical joints, Computers & Structures, 87 (2009) 913-929.
 Q. Tian, C. Liu, M. Machado, P. Flores, A new model for dry and lubricated cylindrical joints with clearance in spatial flexible multibody systems, Nonlinear Dynamics, 64 (2011) 25-47.
 V.L. Reis, G.B. Daniel, K.L. Cavalca, Dynamic analysis of a lubricated planar slider–crank mechanism considering friction and Hertz contact effects, Mechanism and Machine Theory, 74 (2014) 257-273.
 M. Machado, J. Costa, E. Seabra, P. Flores, The effect of the lubricated revolute joint parameters and hydrodynamic force models on the dynamic response of planar multibody systems, Nonlinear Dynamics, 69 (2012) 635-654.
 C. Brutti, G. Coglitore, P.P. Valentini, Modeling 3D revolute joint with clearance and contact stiffness, Nonlinear Dynamics, 66 (2011) 531-548.
 I. Khemili, L. Romdhane, Dynamic analysis of a flexible slider–crank mechanism with clearance, European Journal of Mechanics-A/Solids, 27 (2008) 882-898.
 S. Mukras, N.H. Kim, N.A. Mauntler, T.L. Schmitz, W.G. Sawyer, Analysis of planar multibody systems with revolute joint wear, Wear, 268 (2010) 643-652.
 Z. Zhang, L. Xu, Y.Y. Tay, P. Flores, H. Lankarani, Multi-objective optimization of mechanisms with clearances in revolute joints, in: New Trends in Mechanism and Machine Science, Springer, 2015, pp. 423-433.
 S.M. Varedi, H.M. Daniali, M. Dardel, A. Fathi, Optimal dynamic design of a planar slider-crank mechanism with a joint clearance, Mechanism and Machine Theory, 86 (2015) 191-200.
 A. Sardashti, H.M. Daniali, S.M. Varedi, Optimal free-defect synthesis of four-bar linkage with joint clearance using PSO algorithm, Meccanica, 48 (2013) 1681-1693.
 S. Erkaya, I. Uzmay, A neural–genetic (NN–GA) approach for optimising mechanisms having joints with clearance, Multibody System Dynamics, 20 (2008) 69-83.
 S. Rahmanian, M.R. Ghazavi, Bifurcation in planar slider–crank mechanism with revolute clearance joint, Mechanism and Machine Theory, 91 (2015) 86-101.
 J. Chunmei, Q. Yang, F. Ling, Z. Ling, The non-linear dynamic behavior of an elastic linkage mechanism with clearances, Journal of Sound and Vibration, 249 (2002) 213-226.
 A.M. Vaidya, P.M. Padole, A performance evaluation of four bar mechanism considering flexibility of links and joints stiffness, Open Mechanical Engineering Journal, 4 (2010) 16-21.
 S. Erkaya, Prediction of vibration characteristics of a planar mechanism having imperfect joints using neural network, Journal of Mechanical Science and Technology, 26 (2012) 1419-1430.
 G. Yang, J. Yang, C. Qiang, J. Ge, Q. Chen, Natural frequencies of a cantilever beam and block system with clearance while block staying on given position, Journal of Vibration and Control, 19 (2013) 262-275.
 E. Salahshoor, S. Ebrahimi, M. Maasoomi, Nonlinear vibration analysis of mechanical systems with multiple joint clearances using the method of multiple scales, Mechanism and Machine Theory, 105 (2016) 495-509.
 P. Flores, H.M. Lankarani, Contact force models for multibody dynamics, Springer International Publishing, 2016.
 P. Flores, Dynamic analysis of mechanical systems with imperfect kinematic joints, in, University of Minho, Braga, Portugal, 2004.
 J.K. Kevorkian, J.D. Cole, Multiple scale and singular perturbation methods, Springer-Verlag New York, 1996.
 A.H. Nayfeh, D.T. Mook, Nonlinear oscillations, John Wiley & Sons, 1995.
 A.F. El-Bassiouny, Structural modal interactions with internal resonances and external excitation, Physica Scripta, 72 (2005) 132-141.
 R.J. Schiling, S.L. Harris, Applied numerical methods for engineers using MATLAB, Brooks/Cole Publishing Co., Pacific Grove, CA, USA, 2000.