§ 62. Participants. Each plan shall have at least two municipal
corporations as participants. The county shall be one of the
participants in a plan. Any contract agency or contract association
with the approval of the county government and any other public
corporation may by resolution of its governing body elect to become a
participant in a plan established in the county, or, in the case of a
public corporation or contract agency or contract association located in
more than one county, in a plan established in one of such counties;
provided, however, that the rules and regulations adopted pursuant to
section sixty-five of this chapter may exclude from participation in a
plan any type of public corporation or contract agency or contract
association other than the county and cities, towns and villages.