A nice online review of JAXA plans for a hybrid sail/ion-drive mission to Jupiter and the Trojan asteroids can be found in S. Sasaki et al., Japanese mission plan for Jupiter system: the Jupiter magnetospheric orbiter and the Trojan asteroid explorer, presented at EPSC-DPS Joint Meeting 2011. This is its web-address: http://yly-mac.gps.caltech.edu/A_DPS/dps%202011%20/a_dps%202011%20program%20+%20abstracts/pdf/EPSC-DPS2011-1091.pdf, checked successfully on May 20, 2014.
Many texts consider the kinematics of Hohmann transfer orbits. We used R. R. Bate, D. D. Mueller and J. E. White, Fundamentals of Astrodynamics, Dover, NY (1971). A nice source for the numerical values of astronomical and physical constants is K. Lodders and B. Fegley Jr., The Planetary Scientist’s Companion, Oxford University Press, NY (1998).
Our reference for the ion-thruster power level of the NASA Deep Space 1 probe is M. J. L. Turner, Rocket and Spacecraft Propulsion, 2nd ed., Springer-Praxis, Chichester, UK (2005).
The gravity tractor as a NEO deflection scheme has received a fair amount of attention in recent years. One reference is B. Wie, “Deflection and Control of Gravity Tractor Spacecraft for Asteroid Deflection,” Journal of Guidance, Control, and Dynamics, 31, 1413-1423 (2008).
Orbit cranking by solar radiation pressure, as a method of altering orbital inclination without the expenditure of fuel, is considered by C. McInnes on pp. 143-146 of Solar Sailing: Technology, Dynamics, and Mission Applications, Springer-Praxis, Chichester, UK (1999). However, this method was first considered by JPL in the 1970s.
A review of the paintball NEO-diversion suggestion is available on-line as J. Chu, “Paintballs may Deflect an Incoming Asteroid,” MIT News, http://web.mit.edu/newsoffice/2012/deflecting-an-asteroid-with-paintballs-1026.html (accessed February 14, 2013).
The application of the solar collector in NEO deflection is discussed in the paper G. L. Matloff, Deflecting Earth-Threatening Asteroids Using the Solar Collector, Acta Astronautica, 82, 209-214 (2013).
Using both nuclear ion propulsion and solar-photon sailing for very high energy missions was first proposed and analyzed in detail by author Vulpetti in his paper Missions to the Heliopause and Beyond by Staged Propulsion Spacecraft, paper IAA-92-0240, The World Space Congress, Aug. 28 – Sept. 5, Washington D.C. (1992)