Strictly positive definite kernels on the 2-sphere: beyond radial symmetry. - Janin Jäger (CoRR, 2020)

Multiply monotone functions for radial basis function interpolation: Extensions and new kernels. - Martin D. Buhmann; Janin Jäger (J. Approx. Theory, 2020)

Pólya-type criteria for conditional strict positive definiteness of functions on spheres. - Martin D. Buhmann; Janin Jäger (J. Approx. Theory, 2020)

Strict positive definiteness of convolutional and axially symmetric kernels on d-dimensional spheres. - Martin D. Buhmann; Janin Jäger (CoRR, 2021)

Convergence of sparse grid Gaussian convolution approximation for multi-dimensional periodic function. - Simon Hubbert; Janin Jäger; Jeremy Levesley (CoRR, 2022)

Strictly positive definite non-isotropic kernels on two-point homogeneous manifolds: The asymptotic approach. - Jean Carlo Guella; Janin Jäger (CoRR, 2022)

Strictly positive definite kernels on compact Riemannian manifolds. - Jean Carlo Guella; Janin Jäger (CoRR, 2023)

Generalised Wendland functions for the sphere. - Simon Hubbert; Janin Jäger (Adv. Comput. Math., 2023)

New methods for quasi-interpolation approximations: Resolution of odd-degree singularities. - Martin D. Buhmann; Janin Jäger; Joaquín Jódar; Miguel Luis Rodríguez (Math. Comput. Simul., 2024)