https://www.cl.cam.ac.uk/~jdy22/papers/lightweight-higher-ki...
https://cs.emis.de/LIPIcs/volltexte/2015/5231/pdf/21_.pdf
https://www.cl.cam.ac.uk/~jdy22/papers/lightweight-higher-ki...
https://cs.emis.de/LIPIcs/volltexte/2015/5231/pdf/21_.pdf