Maximization of supercontinua in photonic crystal fibers by using double pulses and polarization effects. - Kalashnikov, V.L.; Dombi, P.; Fuji, T.; Wadsworth, W.J.; Knight, J.C.; Russell, P.S.J.; Windeler, R.S.; Apolonski, A. (Applied Physics B: Lasers & Optics, 2003)