1. Integrability conditions on Engel-type manifolds

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   • Der-Chen Chang
   • Jishan Hu

   OriginalPaper 23 June 2015 Pages: 217 - 231

2. Relative operator entropy related with the spectral geometric mean

   • Sejong Kim
   • Hosoo Lee

   OriginalPaper 25 February 2015 Pages: 233 - 240

3. Normal functions and products of spherical derivatives

   • Yan Xu
   • Huiling Qiu

   OriginalPaper 20 March 2015 Pages: 241 - 248

4. Generalized approach to the problem of regression

   • Dariusz Partyka
   • Józef Zaja̧c

   OriginalPaper Open access 15 January 2015 Pages: 249 - 320