Order introducing "Balkenkreuze" (not "balkAn") in Austro-Hungarian Aviation was issued 31st July 1918. It contained general cross drawing, which lead to so called "Fat Crossess Mistake". This drawing showed "fat" cross with wide white outline, and many units took it literaly. But High Command's intention was to copy German crosses, so quickly the 'fat' ones were replaced by thin crosses.
But also war ended quicly too, so there are not so many photographs of the planes with straight crosses.
Ask for more, if you like!
Also search the net, start here:
http://www.wwi-models.org/
Cheers!
G.