Dear Robert,
According to Worldcat (via OCLC, and pardon the LC-transliteration),
the names are Sergei L'vovich Nikolaev and Evgenii Arnol'dovich Khelimskii.
S uvazheniem,
Jack Mc (jmcintos at unixg.ubc.ca) (or, phasing out, the source
address of this message)