[Proj] Slovenian projection?

[Markus Neteler]

Dear list members,

for a research project I got the Slovenian DEM (25m) but
no explanations nor the description of the coordinate system.

The center coordinates are
center easting:  500000.000000
center northing: 112000.000000

State boundaries of the DEM:
n=196000
s=28000
w=374000
e=626000

I was unable to find a reasonable answer in the internet, and
http://www.epsg-registry.org/
lists several systems. Is it Gauss-Krueger based with false easting/northing?
Since I have no reference point, I was unable to guess it.

thanks in advance for a hint,
Markus