Treibich-Verdier potentials and the stationary (m)KDV hierarchy. F. Gesztesy; R. Weikard — 1995 Mathematische Zeitschrift
Floquet theory for linear differential equations with meromorphic solutions. Weikard, R. — 2000 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
On rational and periodic solutions of stationary KdV equations. Weikard, R. — 1999 Documenta Mathematica
On commuting differential operators. Weikard, R. — 2000 Electronic Journal of Differential Equations (EJDE) [electronic only]