1[荷] Peter J.M.Nas.IUAES History [DB/OL] .Site Hosted by the University of Leiden: http: //www.leidenuniv.nl/fsw/iuaes/01 - history.htm.
2[捷] Petr Skalnik.Pardubice Congress [DB/OL].Site Hosted by the University of Leiden: http: //www.leidenuniv.nl/fsw/iuaes/10- 02- PARDUBICECONGRESS.HTM.
