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   81702
   ASCA observations of BL Lacertae and 3C279 are proposed. These sources
   are known as the archetype of the BL Lac objects and OVV quasars, and
   categorized as the low frequency peaked blazars. We propose long term
   observations to measure their structure functions which will reveal the
   central mass and be expected to provide important information of the
   physics around the accretion disk.
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