Origin of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mn>60</mml:mn></mml:msub></mml:math> surface reconstruction resolved by atomic force microscopy
Physical review. B./Physical review. B