.. _refs:

References
=============

.. [Shepperd1985] Shepperd, S. W. (1985) "Universal Keplerian state transition matrix", Celestial Mechanics and Dynamical Astronomy, 35(2):129–144

.. [Vallado2013] Vallado, D. A. (2013) "Fundamentals of astrodynamics and applications, 4th edition", Space Technology Library. Microcosm Press, El Segundo, CA

.. [Vinti1998] Vinti, J. P. (1998) "Orbital and celestial mechanics", Charles Stark Draper Laboratory, Inc., Cambridge, MA