@book{Sidi97,
        author    = "Marcel J. Sidi",
        title     = "Spacecraft Dynamics and Control: a Practical Engineering Approach",
        address   = "Cambridge, UK",
        publisher = "Cambridge University Press",
        year      = "1997"
}

@patent{Whitmore98,
        author    = "Stephen A. Whitmore", 
        title     = "Closed-Form Integrator for the Quaternion (Euler Angle) Kinematics Equations", 
        year      = "1998" 
}
