How can I obtain famous articles which are not available online? I have Googled myself to death, but have been unable to find the following articles:


Breen, E., Monro, D., 1994. An evaluation of priority queues for 
mathematical morphology.
R. Beare and H. Talbot., 1999 Exact seeded region growing for image 
segmentation.


These articles are well known, important and often cited by others, but they seem to be impossible to find. Does anyone know where I could find these or maybe someone could point me in the right direction?



More generally,


  What should I do when I cannot find an online copy of an article?
It seems that:


The first paper was published in Mathematical Morphology and Its Applications to Image Processing, J. Serra and P. Soille (Eds.), Kluwer 1994, ISBN 0-7923-3093-5 (a.k.a. Proc. 2nd International Symposium on Mathematical Morphology, ISMM 1994). Amazon link.
The second paper was published in Proc. DICTA 1999. Worldcat knows about the book. It seems that there are at least two Australian libraries that have it in their collections, so it should be possible to order copies of articles from them.


Fairly often, the interlibrary services of university libraries can provide copies of papers published in hard-to-find books and journals.

As Peter Shor suggested in comments, you can also try to contact the authors. Usually, authors will be happy to send you copies of their articles – after all, researchers write papers in order to make their results as widely known as possible.