On computing joint invariants of vector fields
  A constructive version of the Frobenius integrability theorem -- that can be programmed effectively -- is given. This is used in computing invariants of groups of low ranks and recover examples from a recent paper of Boyko, Patera and Popoyvich \cite{BPP}. 
H. Azad, I. Biswas, R. Ghanam and M.T. Mustafa
math.DG math-ph math.MP