by Röllgen, F.W., Giessmann, U., Heinen, H.J., Beckey, H.D.
Published in Ultramicroscopy (1979)

by D.G. PETERSON, R.E. LINDSTROM, H.J. HEINEN
Year of Publication 11.12.1980

by Bisdom E.B.A, Henstra S, Jongerius A, Heinen H.J, Meier S
Published in Netherlands Journal of Agricultural Science (1981)

by Beckey, H D, Gierlich, H H, Heinen, H J, Hilt, E
Published in Journal of physics. E, Scientific instruments (01.05.1975)