Title says it all. Have tried googling and my college library, but no success so far.
I. Ruzsa, On the cardinality of $A + A$ and $A − A$. In Combinatorics (Keszthely, 1976), Coll. Math. Soc. Bolyai 18, Akadémiai Kaidó (1979), 933–938
Title says it all. Have tried googling and my college library, but no success so far.
I. Ruzsa, On the cardinality of $A + A$ and $A − A$. In Combinatorics (Keszthely, 1976), Coll. Math. Soc. Bolyai 18, Akadémiai Kaidó (1979), 933–938
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