The documents distributed by this server have been provided by the contributing
authors as a means to ensure timely dissemination of scholarly and technical
work on a noncommercial basis. Copyright and all rights therein are maintained
by the authors or by other copyright holders, notwithstanding that they
have offered their works here electronically. It is understood that all
persons copying this information will adhere to the terms and constraints
invoked by each author's copyright. These works may not be reposted without
the explicit permission of the copyright holder.