Felix finster defnition of the dirac sea in the presence of external fields
Bunch-Nielsen-Sorensen formula
SPECTRAL FLOW IN THE SL(2,R) WZW MODEL Carmen A. Núñez I.A.F.E. & UBA WORKSHOP: New Trends in Quantum Gravity Instituto de Fisica, Sao Paulo Septembre.
SPECTRAL FLOW IN THE SL(2,R) WZW MODEL
Our understanding of M-theory is still very incomplete.
