Nonparametric statistics on manifolds with applications to shape spaces
  This article presents certain recent methodologies and some new results for the statistical analysis of probability distributions on manifolds. An important example considered in some detail here is the 2-D shape space of k-ads, comprising all configurations of $k$ planar landmarks ($k>2$)-modulo translation, scaling and rotation. 
Abhishek Bhattacharya, Rabi Bhattacharya