L. G. Gevorkov

First Detection of 4He in a Sample of Interstellar Neutral Gas Collected Onboard Mir Station

O. Eugster, P. Bochsler, Y. Agafonov, 2000 .

Method and Results of Direct Measurement of the Interstellar Neutral Helium Abundance and Isotopic Composition

A. V. Kochetkov, O. Eugster, P. Bochsler, 2002 .