First, (Ando and Zhang, 2005) does not describe the unlabeled data used in their NER experiments in detail, and second, we are not licensed to use the TREC corpus including WSJ unlabeled data that they used for their Chunking experiments (training and test data for Chunking is derived from WSJ).
we simply used the supplied unlabeled data of the CoNLL-2003 shared task for both NER and Chunking.