TY JOUR TI Efficiency of Understanding of Law in the Modern Legal Science KW Understanding of law KW essence of law KW principles of scientific knowledge KW certainty KW uncertainty KW integrative legal thinking KW natural law school KW legal positivism KW libertarian understanding of law KW communicative theory of law KW materialistic theory of law. JO Journal of Russian Law AU Vlasyenko, N.A. PY 2015 IS 3 PB Legal publishing house Norm