. . "Atomtheorie." . . . . "Modern atomic theory an elementary introduction"@en . . . . . "Modern Atomic Theory. An elementary introduction"@en . . . . . . "Modern atomic Theory" . "Modern atomic theory : an elementary introduction" . "Modern atomic theory : an elementary introduction"@en . "Modern Atomic Theory"@en . "Modern atomic theory; an elementary introduction"@en . . "Modern atomic theory"@en . . . . . . .