http://www.sec.gov/Archives/edgar/data/1419828/000110465917016383/a17-7457_17424b2.htm
http://www.sec.gov/Archives/edgar/data/1531619/000119312517080806/d291294d424b5.htm
http://www.sec.gov/Archives/edgar/data/864270/000119312517082185/d356963d424b2.htm