Sign changes of Hecke eigenvalues of Siegel cusp forms of genus two

Winfried Kohnen
2007 Proceedings of the American Mathematical Society  
We shall show that the eigenvalues of a Hecke eigenform of integral weight and genus 2 not contained in the Maass space change signs infinitely often.
doi:10.1090/s0002-9939-06-08570-4 fatcat:psw5f4odpvdzjjijrnvya6epsa