Using the same source as before (Luftwaffe losses summary), I found that in June-July 1944:
_ JG 54 on the whole lost a total of 207 aircraft, 123 being destroyed (damage > 60%) and 84 damaged.
_ if we exclude III./JG 54 that was on the West front, the figure is 112 losses, 55 destroyed and 57 damaged
For all SG units (almost all being on the Eastern front, except a short period on Western Front for III./SG 4), I have 503 losses, 309 destroyed and 194 damaged.
So Khazanov and Medved are close to truth for East Front losses in this period, but their figures included damaged and destroyed aircraft.
PS: by the way my source is the website of Andreas Brekken and co, where the data is available through a database:
http://www.ahs.no/ref_db/lw_summ_los...iew.asp?PAGE=1