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I really appreciate if anyone could help me to get this paper:

bertin, d. bittani, s., bolzern, p., (1986) Tracking of nonstationary systems by means of different prediction-error directional forgetting techniques, 2nd ifac workshop on adaptive systems in control and signal processing

D. Bertin, S. Bittanti, and P. Bolzem, “A prediction-error directional forgetting technique for recursive estimation,” Systems Science, vol. 11, pp. 33-39, 1985.

thanks

Sorry, no luck. :-( It look like it's a book (of conference proceedings), but I have no idea how you would get hold of it. Maybe interlibrary loan?

http://www.amazon.co.uk/Workshop-Adaptive-Systems-Control-Processing/dp/B0000EHGRK/ref=sr_1_1?ie=UTF8&qid=1308289273&sr=8-1
http://books.google.co.uk/books?id=3tMWcgAACAAJ&dq=%222nd+ifac+workshop+on+adaptive+systems+in+control+and+signal+processing%22&hl=en&ei=pej6TduPEMzYsgbundzaDw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCsQ6AEwAA

Huhu I have access to the International Journal of Systems Science but can't find any articles by bertin etc when I did a search.

Have you got the exact details? i.e. issue and volume ....

And is th IJSS the same as Systems Science because Vol 11 of IJSS was not 1985. 1985 = Vol 16 in IJSS

Let me know and I'll help if I can

Hi Moonblue- Thank u so much. I never though it is some kind of a book. I'm going to find it in my uni library right now. Thanks a lot.
Hi Thephder- I'm very sorry. Yup, there is some mistake in the title that I typed for the paper from International Journal of Systems Science. The correct ones are only the two above. Thank you for helping and sorry for taking your time.