Földi Tivadar;  Bérczi Szaniszló;  Palásti Erzsébet:   Experimental instrument on hunveyor for collecting bacteria by their electrostatic coagulation with dust grains (Foeldix) : observation of electrostatical precipitated coagulated units in a nutrient detector pattern.  In: Acta mineralogica-petrographica, (44).  pp. 19-22. (2003)