inhalemag.com/hans-kotter-use-light/

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www.gooood.hk/Big-Bang-Interruption.htm

www.european-house-of-art.qxd8.com/more_light/index.html

www.patrickheide.com

www.hans-kotter.com

www.i-ref.de/2013/07/29/licht-fabe-raum-hans-kotter-verhandelt-grundelemente

www.hans-kotter.com/dir_upload/download/thumb/d93fad57c10a0b594f2a344269bd.pdf

www.galeria-impakto.com/artists

www.hans-kotter.com/dir_upload/download/thumb/5810c54d403d4c6bd2790ae97b47.pdf