TY - JOUR AU - Yueming Xu AU - Richard McCray AU - Ernesto Oliva AU - S. Randich BT - The Astrophysical Journal DA - Jan-02-1992 DO - 10.1086/171003 PY - 1992 EP - 181 T2 - The Astrophysical Journal TI - Hydrogen recombination at high optical depth and the spectrum of SN 1987A UR - http://adsabs.harvard.edu/full/1992ApJ...386..181X VL - 386 SN - 0004-637X ER -