... tage of this technique is the difficulty of quantita- 0008-4042/81/030549-06$01 .W/O 01981 National Research Council of Canada/Conseil national de recherches du Canada Page 2. ... CrossRef] 8. G Sasvari, C Juhasz, J Hirsch. ... Journal of Physics: Condensed Matter 9, 6467-6474 ...