Question: During what Olympic Games did coach Paul Ziert's men's gymnastic team win two gold medals? 

Context articles: Nellie Kim
Sim Kwon-ho
Rebecca Adlington
Johan Grøttumsbråten
Zhao Yunlei
Bart Conner
Angelė Rupšienė
Paul Ziert
Terence Anderson (sport shooter)
Michael Phelps

Nellie Vladimirovna Kim (Russian: Нелли Владимировна Ким ; born 29 July 1957) is a retired Soviet gymnast who won three gold medals and a silver medal at the 1976 Summer Olympics in Montreal, and two gold medals at the 1980 Summer Olympics.
 She was the second woman in Olympic history to earn a perfect 10 score and the first woman to score it on the vault and on the floor exercise, rivaling Nadia Comăneci, Ludmilla Tourischeva, and other strong competitors of the 1970s.
 Nellie Kim worked for a long time as a coach, training several national teams, and judged many major international competitions.
 As President of the Women's Artistic Gymnastics Technical Committee, she coordinates the introduction of new rules in women's gymnastics, as provided by the new "Code of Points", developed by the FIG in 2004–2005 and in effect since 2006.
 Her gymnastic appearances are remembered for "her strong feminine, temperamental and charismatic appeal".
Sim Kwon-Ho (Hangul: 심권호, Hanja: 沈權虎; born October 10, 1972 in Seongnam, South Korea) is a retired South Korean Greco Roman wrestler.
 He won gold medals at the 1996 and 2000 Olympic Games, and is the only South Korean wrestler to win two gold medals in the Olympics.
Rebecca Adlington, OBE (born 17 February 1989) is an English former competitive swimmer who specialised in freestyle events in international competition.
 She won two gold medals at the 2008 Summer Olympics in the 400-metre freestyle and 800-metre freestyle, breaking the 19-year-old world record of Janet Evans in the 800-metre final.
 Adlington was Britain's first Olympic swimming champion since 1988, and the first British swimmer to win two Olympic gold medals since 1908.
 She won bronze medals in both the women's 400-metre and 800-metre freestyle events in the 2012 Summer Olympics in London.
Johan Hagbart Pedersen Grøttumsbraaten (12 February 1899 – 24 January 1983) was a Norwegian skier who competed in Nordic combined and cross-country.
 Dominating both events in the 1920s and early 1930s, he won several medals in the early Winter Olympics.
 Most notably, he won two gold medals at the 1928 Winter Olympics, and as one of the only two entrants to win two gold medalists from St. Moritz, was the most successful athlete there, along with Clas Thunberg of Finland.
 He previously won three medals (one silver, two bronzes) at the inaugural Winter Olympics held in Chamonix in 1924, and went on to defend his Olympic Nordic Combined at the 1932 Winter Olympics.
Zhao Yunlei (born August 25, 1986) is a mixed and women's doubles badminton athlete from China.
 She graduated with a BA from Huazhong University of Science and Technology.
 She is the first and only badminton player to have ever won two Gold medals in the same Olympic edition, winning in both the Mixed and Women's Doubles categories in 2012.
 Zhao joins the ranks with nine other players with two Olympic Gold Medals, the highest number of Gold Medals won by any badminton athlete.
 Through her performance at the 2014 and 2015 BWF World Championships, she became the first player to win two consecutive gold medals in two consecutive BWF World Championships.
Bart Conner (born March 28, 1958) is a retired American Olympic gymnast.
 As a member of the men's gymnastics team at the 1984 Summer Olympic Games, Conner won two gold medals.
 He currently owns and operates the Bart Conner Gymnastics Academy in Norman, Oklahoma, along with his wife, Romanian Olympic gold medalist Nadia Comăneci.
 In addition, both Comăneci and Conner are highly involved with the Special Olympics.
Angelė Rupšienė (née Jankūnaitė; born 27 June 1952 in Vilnius, Lithuanian SSR) is a retired Lithuanian professional basketball player, who most notably played for BC Kibirkštis Vilnius.
 She won two gold medals in the 1976 Montreal Olympic games and 1980 Moscow Olympic games, three gold medals during European Championship and two gold medals during World Championship, playing for Soviet Union national basketball team.
Paul Ziert is a former University of Oklahoma gymnastics coach.
 Ziert recruited Bart Conner to the school.
 In 1977 and 1978, Ziert's teams won the NCAA Men's Gymnastics championship.
Terence "Terry" M. Anderson (born c. 1946) is a retired Australian-born American sports shooter who specialized in the 25 meter rapid fire pistol event.
 He won the national championships in Australia in 1969 and 1971, in New Zealand in 1971–1973 and in the United States in 1975, 1977, 1979, 1993, 1997, 1999, 2000.
 Internationally he won three gold medals and a silver medal at the 1972 Asian Championships.
 Won two gold medals setting the Hemisphere record at the 1977 Championships of the Americas.
 Pan Am Games silver medal at the 1979 Pan Am Games, two gold medals, the Pan Am and world record at the 1983 Pan Am Games and four gold medals at the 1995 Pan American Games.
 He was selected to the 1980 Olympic team, but missed the games due to their boycott by the United States and selected to the 1996 Olympic Team in Atlanta.
Michael Fred Phelps II (born June 30, 1985) is an American former competitive swimmer and the most decorated Olympian of all time, with a total of 28 medals.
 Phelps also holds the all-time records for Olympic gold medals (23), Olympic gold medals in individual events (13), and Olympic medals in individual events (16).
 In winning eight gold medals at the 2008 Beijing Games, Phelps broke fellow American swimmer Mark Spitz's 1972 record of seven first-place finishes at any single Olympic Games.
 At the 2004 Summer Olympics in Athens, Phelps had already tied the record of eight medals of any color at a single Games by winning six gold and two bronze medals.
 At the 2012 Summer Olympics in London, Phelps won four gold and two silver medals, and at the 2016 Summer Olympics in Rio de Janeiro, he won five gold medals and one silver.
 This made him the most successful athlete of the Games for the fourth Olympics in a row.