0121-1129 0121-1129 S0121-11292017000100009 10.19053/01211129.v26.n44.2017.5768 Colombia Colombia Colombia 00 04 2017 00 04 2017 26 44 9 21

[1] 2016 [2] 2016 [3] 2012 [4] 2015 [5] 2008 [6] 2004 1340 [7] 2016 [8] 1996 [9] 2008 Nanjing, China 1559-63 [10] 2011 Beijing, China 2076-81 [11] 2009 Nagpur, India 521-6 [12] 2009 1113-8 [13] 2004 [14] 2015 [15] 2006 21 1 1 150-6 [16] 1991 Tokyo, Japan 1116-9 [17] 2012 Las Vegas, USA 584-8 [18] Comisión de Regulación de Energía y Gas [19] 2006 Stockholm, Sweden 1-7