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A Tribute to Aarni Nyberg on his 60th birthday
edited by Pekka Lehtonen and Antti Somerv...
Bok Språk ikke angitt 1987
On the nonlinear estimation and testing of econometric models
Pekka Lehtonen
Bok Engelsk 1980
Suomen metalliteollisuuden kassavirta-analyysi vv. 1974-1978
Pekka Lehtonen, Erkki Paarijoki, Timo Sum...
Bok Finsk 1980