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[2] Barbee, Brent W. "Design of Spacecraft Missions to Remove Multiple Orbital Debris Objects." (n.d.): n. pag. 12                   Feb. 2012. Web. <http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20120008259.pdf>.

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[4] "5 High-Tech Space-Junk Solutions." Popular Mechanics. N.p., 08 Mar. 2012. Web. 08 Dec. 2015.                                         <http://www.popularmechanics.com/space/g824/5-high-tech-space-junk-solutions/>.

[5] Wikipedia. Wikimedia Foundation, n.d. Web. 08 Dec. 2015. <https://en.wikipedia.org/wiki/Earth-centered_inertial>.

[6] "Space Debris Expert Warns about Dangers of Orbital Junk." Space Debris Expert Warns about Dangers of Orbital               Junk. N.p., n.d. Web. 08 Dec. 2015. <http://phys.org/news/2015-01-space-debris-expert-dangers-                                   orbital.html>.

[7] "Vectorized Clohessy-Wiltshire Hill Linear Propagation - File Exchange - MATLAB Central." Vectorized                             Clohessy-Wiltshire Hill Linear Propagation. N.p., n.d. Web. 08 Dec. 2015.                                                                       <http://www.mathworks.com/matlabcentral/fileexchange/39340-vectorized-clohessy-wiltshire-hill-linear-                       propagation>.