This paper presents methods of orbit transfer for small planetoids from the main belt to the future colonies on Mars using current technologies. The results show that by using nuclear weapon or even kinetic energy weapon (for retrograde bodies) asteroids with masses up to about 100 tons can be moved. Both options assume that asteroid will survive explosion.
 D. G. Korycansky, G. Laughlin and F. C. Adams, “Astronomical Engineering: A Strategy for Modifying Planetary Orbits,” Astrophysics and Space Science, Vol. 275, No. 4, 2001, pp. 349-366.
 J. Gil-Fernández, R. Panzeca and C. Corral, “Impacting Small Near Earth Objects,” Advances in Space Research, Vol. 42, No. 8, 2008, pp. 1352-1363. http://dx.doi.org/10.1016/j.asr.2008.02.023