Hi all. Anybody knows if these papers are freely available ?

http://www.memorymanagement.org/bib/ungar88.html
http://www.memorymanagement.org/bib/f.html#db76
http://www.memorymanagement.org/bib/f.html#ungar84
http://www.memorymanagement.org/bib/hmdw91.html
http://www.memorymanagement.org/bib/f.html#cw86

regards

Hernán

PS: Sorry if the question has been asked previously.