The ftp directory reachable with

ftp ftp.ccs.neu.edu

through anonymous ftp (login = ftp, password = your email address)
contains in directory:

pub/people/lieber

the files

ecoop94-tut.ps		ECOOP '94 tutorial

semantics-ad-soft.ps	Efficient implementation of adaptive software
			Jens Palsberg, Cun Xiao and Karl Lieberherr

You may want to use the world-wide web to get to this information using
the command:

xmosaic http://www.ccs.neu.edu/home/lieber

select: Demeter/Papers/Papers in Progress/semantics-ad-soft.ps