Kloosterman Sums and Fourier Coefficients of Cusp Forms. H. Iwaniec, J.-M. Deshouillers (1982/1983) Inventiones mathematicae
Kolyvagin's method for Chow groups of Kuga-Sato varieties. Jan Nekovár (1992) Inventiones mathematicae
Kummer's Criterion for the Special Values of Hecke L-Functions of Imaginary Quadratic Fields and Congruences Among Cusp Forms. Haruzo Hida (1982) Inventiones mathematicae