Vladimir V.Knauf  Ph.D.:                NATI Research JSC., St.Petersburg.
                                                     ("PPM-mineralogy", Microbrobe, Geological stuty)

Elena N.Afanasieva  Ph.D.:             All-Russia Geological Institute, St.Petersburg.
                                                     (Sampling, Geological stuty)

Anatoly V.Savitsky  Ph.D.:             All-Russia Geological Institute, St.Petersburg.
                                                     (Sampling, Geological stuty)

Nikolay S.Rudashevsky D.Sc.:       "Mekhanobr-Analit", St.Petersburg.
                                                     (Microprobe analyses, Geological stuty)