the percentage ratio of the number of foreign workers and employees to Russian workers and employees, both in the total sum and within individual categories, is established by agreement of the parties upon the conclusion of each concession agreement separately...
10) The concessionaire may be granted the right, by agreement with the government bodies of the RSFSR, to invite highly qualified specialists from among Russian citizens; the terms of employment in each individual case must be agreed upon with the central authorities.
[11) In agreements with concessionaires, include each time an indication that the term of employment, as well as any other conditions concerning labor, are agreed upon with the corresponding trade union.]