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Very interesting source, it is a BL Lac-type object, with weak emission lines at z=0.94, but also with strong absorption lines at z=0.524 (and a weak one at z=0.852), where the absorption at z-0.524 is also seen in H I in radio
The last result indicates there is a galaxy in the line of sight, and it is seen as a "damped Ly alpha" absorption system of hydrogen (Hubble opt/UV spectroscopy); definitive info on absorption in paper by Junkkarinen (2004, ApJ, 614, 658)
Presence of galaxy in the line of sight might be suggestive of explanation of variability as microlensing events
Strong gamma-ray emitter reported by EGRET (Hunter et al. 1993), but variable - observations in 1994 (Madejski et al. 1996) showed much fainter gamma flux
Rapidly variable X-ray emitter, studied by ROSAT and Asca (also Madejski et al. 1996)
X-ray data clearly show excess absorption (due to intervening galaxy); in conjunction with H I and H Ly alpha data, yield metallicity of the intervening absorber
For important and relevant papers - especially containing gamma-ray data - I'd add Hunter et al. 1993 (A&A 272, 59) and Madejski et al. 1996 (ApJ, 459, 156)
This is the NED entry http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=0235%2B164&extend=no&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES

Name	RA	DEC	Redshift	L	B
0235+164	39.66	16.62	0.940	156.77	-39.11

Paper	Authors	Title
2008A&A...480..339R	Raiteri, C. M. et al.	Radio-to-UV monitoring of AO 0235+164 by the WEBT and Swift during the 2006-2007 outburst
2007A&A...464..871R	Raiteri, C. M. et al.	Spectroscopic monitoring of the BL Lac object AO 0235+164
2006ApJ...650..749L	LIU, F. K.; ZHA	HARMONIC QPOS AND THICK ACCRETION DISK OSCILLATIONS IN THE BL LACERTAE OBJECT AO 0235+164
2006A&A...459..731R	Raiteri, C. M. et al.	Multifrequency variability of the blazar AO 0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis
2006A&A...452..845R	Raiteri, C. M. et al.	X-ray emission from the blazar AO 0235+16: the XMM-Newton and Chandra point of view
2005A&A...438...39R	Raiteri, C. M. et al.	The WEBT campaign to observe AO 0235+16 in the 2003-2004 observing season. Results from radio-to-optical monitoring and XMM-Newton observations
2001A&A...377..396R	Raiteri, C. M. et al.	Optical and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicity
2001A&A...376...69C	CHEN, Y., JIANG	THE SPECTRAL ENERGY DISTRIBUTION OF AO 0235+164 DURING TWO ACTIVE OPTICAL PHASES
2000AJ....120...41W	WEBB, J., HOWARD	THE 1997 OUTBURST OF AO 0235+164: EVIDENCE FOR A MICROLENSING EVENT?
1996AJ....112.2533B	BURBIDGE, E. M	AO 0235+164 AND SURROUNDING FIELD: SURPRISING HST RESULTS