Memoirs of the American Mathematical Society, ISSN 0065-9266 ; Volume 97, Number 469
Print version: Hejhal, Dennis A. Eigenvalues of the Laplacian for Hecke triangle groups. Providence, Rhode Island, United States : American Mathematical Society, c1992 vi, 165 pages Memoirs of the American Mathematical Society ; Volume 97, Number 469. ISBN 9780821825297
"May 1992, Volume 97, Number 469 (end of volume)"--Cover