Matrix exponentials and inversion of confluent Vandermonde matrices. Luther, Uwe, Rost, Karla (2004) ETNA. Electronic Transactions on Numerical Analysis [electronic only]
Models of learning and the polar decomposition of bounded linear operators. Botelho, Fernanda, Davis, Annita (2010) Electronic Journal of Differential Equations (EJDE) [electronic only]
m-Reduction of ordinary differential equations Krystyna Skórnik, Joseph Wloka (1998) Colloquium Mathematicae
Multi-parameter symmetries of first order ordinary differential equations. Walcher, Sebastian (1999) Journal of Lie Theory