Selmke, Markus; Selmke, Sarah (2016). “Complex artificial halos for the classroom”. American Journal of Physics. American Association of Physics Teachers (AAPT). 84 (7): 561–564. doi:10.1119/1.4953342. ISSN0002-9505.
Großmann, Michael; Möllmann, Klaus-Peter; Vollmer, Michael (15 tháng 12 năm 2014). “Artificially generated halos: rotating sample crystals around various axes”. Applied Optics. The Optical Society. 54 (4): B97-B106. doi:10.1364/ao.54.000b97. ISSN1559-128X.
Selmke, Markus; Selmke, Sarah (2016). “Complex artificial halos for the classroom”. American Journal of Physics. American Association of Physics Teachers (AAPT). 84 (7): 561–564. doi:10.1119/1.4953342. ISSN0002-9505.
Großmann, Michael; Möllmann, Klaus-Peter; Vollmer, Michael (15 tháng 12 năm 2014). “Artificially generated halos: rotating sample crystals around various axes”. Applied Optics. The Optical Society. 54 (4): B97-B106. doi:10.1364/ao.54.000b97. ISSN1559-128X.