Ex : 6

1- http://164.115.27.97/digital/files/original/303892dafba964c462f47a7a8d3916b6.pdf

2- http://www.pathumrat.ptpk.ac.th/webmath/content/EB-Scilab.pdf 

https://docs.google.com/document/d/1nZWq1O8IEikBn8TvcHCLjmOJsoQyMrPDSgmxhF3zpJ0/edit?usp=sharing