. . . "Topological string theory" . "topological B-model" . "topological M-theory" . "topological B model string theory" . . "topological A-model" . "B-model" . "string theory" . . "A-model" . . "Topological string theory#B-model" . "Topological string theory#A-model" . . "topological twist" . . "topological string theory" . "topological string theories" . . "topological string" . "closed A-model" . "Topological string theory#Topological M-theory" . "Topological string theory" .