inhalemag.com/hans-kotter-use-light/
www.contemporist.com/2013/12/17/big-bang-interruption-by-hans-kotter
www.gooood.hk/Big-Bang-Interruption.htm
www.european-house-of-art.qxd8.com/more_light/index.html
www.hans-kotter.com/dir_upload/download/thumb/5810c54d403d4c6bd2790ae97b47.pdf
www.suart.syr.edu/suart-exhibitions/featured-artist-hans-kotter/#.Ux9A2yhx6nR