TY - CPAPER TI - Chemistry olympiads –: 20 years of the São Paulo model where authors of the best thematic essays qualify for a final examination based on live chemistry demonstrations PY - 2017 AU - Gutz, Ivano Gebhardt Rolf AU - El Seoud, Omar A AU - Bertotti, Mauro AU - Angnes, Lúcio AU - Temperini, Márcia Laudelina Arruda AU - Lopes, Fernando Silva AU - Pedrotti, Jairo José T2 - World Chemistry Congress J2 - Proceedings UR - http://www.neopixdmi.com.br/@mci/iupac2017/ PP - Durham PB - International Union of Pure and Applied Chemistry (IUPAC) ER -