-(ftp://ftp.isi.edu/in-notes/rfc1952.txt) (May 1996). The `zip'
-deflation format is specified in P. Deutsch, DEFLATE Compressed Data
-Format Specification version 1.3, Internet RFC 1951
-(ftp://ftp.isi.edu/in-notes/rfc1951.txt) (May 1996).
+(http://www.ietf.org/rfc/rfc1952.txt) (May 1996). The `zip' deflation
+format is specified in P. Deutsch, DEFLATE Compressed Data Format
+Specification version 1.3, Internet RFC 1951
+(http://www.ietf.org/rfc/rfc1951.txt) (May 1996).