Li coefficients for automorphic L -functions Jeffrey C. Lagarias (2007) Annales de l’institut Fourier Xian-Jin Li gave a criterion for the Riemann hypothesis in terms of the positivity of a set of coefficients λ n ( n = 1 , 2 , ...
Local L-factors of motives and regularized determinants. Christopher Deninger (1992) Inventiones mathematicae