http://www.php.net/manual/en/pdf.examples-basic.php

http://blog.ryankempt.com/2013/05/fill-in-pdf-form-with-php.html

http://php.net/manual/es/book.pdf.php

http://www.fpdf.org/

http://stackoverflow.com/questions/11904090/pdf-form-filling-with-fpdf

http://stackoverflow.com/questions/13944347/fpdf-merge-error-field-not-found-in-pdf-template-using-fpdm-php-to-fill-form-da

http://stackoverflow.com/questions/13093772/can-i-create-an-editable-pdf-with-fpdf