Analysis of information sources in references of the Wikipedia article "Men's pole vault world record progression" in English language version.
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: CS1 maint: archived copy as title (link) (p.546) Sergey Bubka set an indoor record of 6.15 m (20 ft 2 in) on February 21, 1993, in excess of the outdoor record, before this rule came into effect. Lavillenie's indoor world record was set after the rule came into effect, and thus since it exceeded Bubka's 6.14 m (20 ft 1+1⁄2 in) set outdoors, it also became the world record, the first indoor mark to do so in this event.{{cite web}}
: CS1 maint: archived copy as title (link) (p.546) Sergey Bubka set an indoor record of 6.15 m (20 ft 2 in) on February 21, 1993, in excess of the outdoor record, before this rule came into effect. Lavillenie's indoor world record was set after the rule came into effect, and thus since it exceeded Bubka's 6.14 m (20 ft 1+1⁄2 in) set outdoors, it also became the world record, the first indoor mark to do so in this event.