Memoirs of the American Mathematical Society, ISSN 0065-9266 ; Number 921
Print version: Lehmkuhl, Thomas. Compactification of the Drinfeld modular surfaces. Providence, Rhode Island : American Mathematical Society, c2009 xi, 94 pages Memoirs of the American Mathematical Society ; Number 921., ISBN 9780821842447
"January 2009, volume 197, number 921 (third of 5 numbers)."