Multivariate stratified sampling by stochastic multiobjective   optimisation
  This work considers the allocation problem for multivariate stratified random sampling as a problem of integer non-linear stochastic multiobjective mathematical programming. With this goal in mind the asymptotic distribution of the vector of sample variances is studied. Two alternative approaches are suggested for solving the allocation problem for multivariate stratified random sampling. An example is presented by applying the different proposed techniques. 
Jose A. Diaz-Garcia and Rogelio Ramos-Quiroga
stat.ME