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00A07 Problem books (2 articles)

• Halmos, Paul R.: Jádro matematiky. (Czech) [The heart of mathematics]. Pokroky matematiky, fyziky a astronomie, vol. 27 (1982), issue 5, pp. 273-281
• Erdös, Pál; Sárközy, András: Some solved and unsolved problems in combinatorial number theory. (English). Mathematica Slovaca, vol. 28 (1978), issue 4, pp. 407-421