Original Research Published on 07 May 2021 4D Printing Dual Stimuli-Responsive Bilayer Structure Toward Multiple Shape-Shifting in Smart Materials Luquan RenBingqian LiQingping LiuLei RenZhengyi SongXueli ZhouPeng Gao Frontiers in Materials doi 10.3389/fmats.2021.655160 7,679 views 46 citations