A few useful reference papers

• Berdyugin, A., Snare, M.O., Teerikorpi, P., 1995, Interstellar polarization at high galactic latitudes from distant stars. 2.: First results for Z less than or equal to 600 pc, A&A 294, 568
  
  
• Berdyugin, A., Piirola, V., 1999, Polarization variability in magnetic white dwarfs GD 229 and G 240-72, A&A 352, 619
  
  
• Egonsson, J., Hakala, P., 1991, Discovery of variable optical polarization in HER X-1, A&A 244, L41
  
  
• Gullbring, E., Gahm, G., 1996, Simultaneous multicolor photometric and polarimetric observations of four T Tauri stars, A&A 308, 821
  
  
• Hakala, P.J., Piirola, V., Vilhu, O., Osborne, J.P., Hannikainen, D.C., 1994, Record Circular Polarization Discovered in the Shortest Period Cataclysmic Variable RE:1307+535, MNRAS 271, L41
  
  
• Katajainen, S., Lehto, H.J., Piirola, V., Karttunen, H., Piironen, J., 2000, AM Herculis star EV UMa (RE 1307 +535) in a high accretion state, A&A 357, 677
  
  
• Korhonen, T., Piirola, V., Reiz, A., 1984, Polarization measurements at La Silla, ESO Messenger, Dec. 1984, p. 20
  
  
• Piirola, V., 1973, A double image chopping polarimeter, A&A 27, 383
  
  
• Piirola, V., 1988, Simultaneous five-colour (UBVRI) photopolarimeter , In: Polarized radiation of Circumstellar Origin, eds. G.V. Coyne et al., Univ. of Arizona Press, p. 735
  
  
• Piirola, V., Hakala, P.J., Coyne, G.V., 1993, The discovery of variable polarization over the 13.9 minute spin period of the intermediate polar RE 0751 + 14 ApJ 410, L107
  
  
• Piirola, V., Coyne, G.V., Takalo, S.J., Takalo, L., Larsson, S., Vilhu, O., 1994, UBVRI polarimetry of AM Herculis-type binaries. 5: The asynchronous(?) polar BY Camelopardalis (H0538+608), A&A 283, 163
  
  
• Piirola, V., 1999, Polarimetry at the NOT, In: Astrophysics with the NOT, eds. H. Karttunen, V. Piirola, University of Turku, p. 63 (or see ps file, Fig. 1 , Fig. 2 ).
  
  
• Sillanpää, A., Takalo, L.O., Kikuchi, S., Kidger, M., de Diego, J.A., 1991, Internight and intranight variations in the wavelength dependent polarization of OJ287, AJ 101, 2017
  
  
• Sillanpää, A., Takalo, L.O., Nilsson, K., Kidger, M., de Diego, J.-A., 1992, A polarized accretion disk flare in OJ 287?, A&A 254, L33
  
  
• Takalo, L., 1991, Simultaneous UBVRI photopolarimetric observations of blazars, A&AS 90, 161
  
  
• Takalo, L.O., Sillanpää, A., Nilsson, K., Kidger, M., de Diego, J.A., Piirola, V., 1992, Simultaneous UBVRI photopolarimetry of blazars II. , A&AS 94, 37
  
  
• Takalo, L.O., Kidger, M.R., de Diego, J.A., Sillanpää, A., 1992, First simultaneous UBVRI photopolarimetric observations of normal quasars, A&A 261, 415
  
  
• Takalo, L.O., Sillanpää, A., Nilsson, K., 1994, Simultaneous UBVRI photopolarimetry of three blazars: 3C66A, S5 0716+714 and OJ 287, A&AS 107, 497
  
  

To be continued.