The more pdf articles or supplements will be bought ion one order, the cheaper each pdf file will be:
1 = 3.50 EUR | 2 = 2.75 EUR | 3 = 2.50 EUR | 4 = 2.00 EUR | 5 = 1.70 EUR | 6 = 1.50 EUR | 7 and more = 1.30 EUR