American Mathematical Monthly 11173 (2005) (download)

Mathematical Magazine Problem 1764 (2007) (download)

American Mathematical 114 Monthly Problem 11277 (oplossing gepubliceerd in Vol. 115, N° 8 , 2008)(download)

Mathematical Magazine Problem 1781 (2007) (oplossing gepubliceerd in Vol. 81, N°5, 2008)(download)

Problem 71 Univ Beograd (download)

Telex 112 (download)
Telex 117 (download)
Telex 119 (download)
Telex 120 (download)
Telex 122 (download)