The X-ray luminosities in quiescent phase for superflare stars Yabuki, Ken ; Tsuboi, Yohko ; Sasaki, Ryo ; Sugawara, Yasuharu ; Katsuda, Satoru ; Maehara, Hiroyuki Abstract Publication: 7 years of MAXI: monitoring X-ray Transients Pub Date: 2017 Bibcode: 2017symm.conf..187Y