Before revision:  In [ 4 ] and 5 the authors suggested a purely probabilistic approach which is based on the Skorohod embedding and does not require a Markovian structure, but is limited to the one dimensional case.
After revision:  In [ 1 ] and 5 the authors suggested a purely probabilistic approach which is based on the Skorohod embedding and does not require a Markovian structure, but is limited to the one dimensional case.