http://www.sec.gov/Archives/edgar/data/1053092/000095010317009115/dp80756_424b2-u2142.htm
http://www.sec.gov/Archives/edgar/data/1124941/000119312517291378/d458311d424b5.htm
http://www.sec.gov/Archives/edgar/data/1652133/000119312517291395/d363619d424b4.htm