Azumaya-type noncommutative spaces and morphisms therefrom: Polchinski’s D-branes in string theory from Grothendieck’s viewpoint

Morphisms from Azumaya prestable curves with a fundamental module to a projective variety: Topological D-strings as a master object for curves

Si Li, Chien-Hao Liu, Ruifang Song, and Shing-Tung Yau