Controlled Flight of a Biologically Inspired, Insect-Scale Robot

TLDR

"A feedback control system enabled the tethered robotic fly to hover and perform controlled flight maneuvers." Good. Other: content: "[Other] Ma et al." That seems like a citation? The other label contains "Ma et al." Possibly a reference. According to rules, if other contains essential meta info like code links etc.

Abstract

Lord of the Robotic Flies While small-scale flying objects are ubiquitous in nature, they are quite hard to engineer. As sizes get smaller, fixed-winged flight becomes less efficient because of increased drag resistance. Ma et al. (p. 603 ) developed a tethered robotic fly with wings that flap through the use of piezo-electric materials. Control of the flight motion involved a feedback process, which allowed the tethered robotic fly to hover and make controlled flight maneuvers.