1. G. Gripenberg, On the asymptotic behavior of solutions of nonlinear integral equations in Banach space, to appear.
2. Remarks on frequency domain methods for Volterra integral equations;MacCamy;J. Math. Anal. Appl.,1976
3. Nonlinear Volterra integral equations with positive definite kernels;Staffans,1975
4. Positive definite measures with applications to a Volterra equation;Staffans;Trans. Amer. Math. Soc.,1976
5. An inequality for positive definite Volterra kernels;Staffans,1976