@inbook{book/206,
title = {without title},
booktitle = {Diethneis Mathematikes Olumpiades},
series = {GDML\_Books},
publisher = {$\Epsilon$.$\Mu$.$\Epsilon$.},
year = {1971},
url = {http://dml.mathdoc.fr/item/book/206}
}
(éd.). without title, dans Διεθνεις Μαθηματικές Ολυμπιάδες, GDML_Books, (1971), . http://gdmltest.u-ga.fr/item/book/206/