A short handy description how to make and save proper enlargements of images of printing flaws, plate variant deviations and plate errors on postage stamps supplemented by a practical demostration. 27. 06. 2015
Philatelic Code of Ethics of the Universal Postal Union, which determines the issue and use of philatelic products in member countries of the Universal Postal Union. 14. 01. 2014
Article about how a "normal man" can affect Slovak stamp production by the design of an own postage stam artwork and other options how to spread own ideas around the world by using official postal products of the Slovak Post. 14. 11. 2013
