dear prof. xxxxx, here within enclosed is our paper for consideration to be published on "( journal name)". the further information about the paper is in the following: the title: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx the authors: xxxxxxxxxx xxxxxxxxxxxx and xxxxxxxxxx the authors claim that none of the material in the paper has been pub lished or is under consideration for publication elsewhere. i am the corresponding author and my address and other information is as fol lows, address: department of xxxxxxxxx, tsinghua university, beijing, 10084, p.r.china e-mail: tel: 86-10-62785001 fax: 86-10-62785001 thank you very much for consideration! sincerely yours, dr. xxxxxxxxxxx