Table 8.

Articles that can be classified by means of their Analytical Tools.

Time series Analysis	[21,23,27,29]
Regression Model	[31,41,54,56]
No Defined	[19,20,22,24,25,26,28,30,35,36,37,38,39,40,42,43,45,46,47,48,50,52,53,55,57,58,59,60,61,62,63,69,73,76,77,78,79,98,99,100,101,102,103,104,105,106,107,108,109,110]