Русско-англо-русский юридический словарь

The burden of producing evidence means that in general the party that cites specific facts for the substantiation of its claim also has the burden of producing the evidence to prove these facts. This burden depends on the substantive law governing the claim. Permissible presumptions and legal rules can shift the burden in various situations. (Britannica)

Substantive law is the statutory, or written law, that defines rights and duties, such as crimes and punishments (in the criminal law), civil rights and responsibilities in civil law. It is codified in legislated statutes or can be enacted through the initiative process.

Substantive law stands in contrast to procedural law, which is the "machinery" for enforcing those rights and duties. Procedural law comprises the rules by which a court hears and determines what happens in civil or criminal proceedings, as well as the method and means by which substantive law is made and administered. (Wikipedia)

ADJECTIVE LAW. The aggregate of rules of procedure or practice. As opposed to that body of law which the courts are established to administer, (called “substantive law,”) it means the rules according to which the substantive law is administered. That part of the law which provides a method for enforcing or maintaining rights, or obtaining redress for their invasion. (Black's Law Dictionary)

The expression “Regulation” should be used to describe the instrument by which the power to make substantive law is exercised. (ForumIAS)