All 3D space problems mentioned in classical mechanics and quantum mechanics books are indeed 4D, the 4th dimension being time! So for example, gyroscope problem is essentially a 4D problem. Do you want book list of classical mechanics and quantum mechanics?
@Singh, am also interested in the question and therefore following it. Having determined the jacobian at (0,0,0,0), I also want to know how to find the other 3 equilibrium points