Practical splitting methods for the adaptive integration of nonlinear   evolution equations. Part I: Construction of optimized schemes and pairs of   schemes
  We present a number of new contributions to the topic of constructing efficient higher-order splitting methods for the numerical integration of evolution equations. Particular schemes are constructed via setup and solution of polynomial systems for the splitting coefficients. To this end we use and modify a recent approach for generating these systems for a large class of splittings. In particular, various types of pairs of schemes intended for use in adaptive integrators are constructed. 
Winfried Auzinger, Harald Hofst\"atter, David Ketcheson and Othmar   Koch
math.NA