{The Redshift Determination of GRB 990506 and GRB 000418 with the Echellete Spectrograph Imager on Keck}
Publication information:
{Bloom}, {Berger}, {Kulkarni}, {Djorgovski}, {Frail}. {The Redshift Determination of GRB 990506 and GRB 000418 with the Echellete Spectrograph Imager on Keck}. \aj. 2003;125:999–1005. doi:10.1086/367805