Export citation and abstract BibTeX RIS
It has come to the attention of IOP Publishing that this article substantially reproduces the content of a contribution to the proceedings of a conference [1], published by IEEE. The authors did not declare this on submission or cite the earlier work.
The author list for the STMP article also has significant differences to the list given in [1].
Due to these issues, we feel that it is appropriate to retract the STMP article.