Pointing control for the SPIDER balloon-borne telescope - Shariff,JA; Ade,PAR; Amiri,M; Benton,SJ; Bock,JJ; Bond,JR; Bryan,SA; Chiang,HC; Contaldi,CR; Crill,BP; Dore,OP; Farhang,M; et al. (GROUND-BASED AND AIRBORNE TELESCOPES V, 2014)