TY - JOUR AU - R. Soria AU - Rosalba Perna BT - The Astrophysical Journal DA - 08/2008 DO - 10.1086/589995 PY - 2008 SP - 767 EP - 772 T2 - The Astrophysical Journal TI - The Oldest X-Ray Supernovae: X-Ray Emission from 1941C, 1959D, and 1968D VL - 683 SN - 0004-637X ER -