On commuting matrix differential operators. Weikard, Rudi — 2002 The New York Journal of Mathematics [electronic only]
On the leading correction of the Thomas-Fermi model: Lower bound. Heinz Siedentop; Rudi Weikard — 1989 Inventiones mathematicae
A new phase space localization technique with application to the sum of negative eigenvalues of Schrödinger operators Heinz Siedentop; Rudi Weikard — 1991 Annales scientifiques de l'École Normale Supérieure