For protection from spam, the authors' email addresses have been obfuscated. They are reprinted below:
l l r e s p r u . d z t r i @ a . a v r . d i f i d @ u d e e u i t a n l w h r a d e uIf they appear on two lines, read the characters left to right, alternating between lines, so the first three characters above would be "lil."