On algebraic structure of pre-operadKluge, Liivi2002 https://www.ester.ee/record=b1688674*est On Lagrange formalism for Lie theory and operadic harmonic oscillator in low dimensions = Lagrange'i formalismist Lie teooriale ja harmooniline operaadostsillaator madalates dimensioonidesVirkepu, Jüri2009 https://www.ester.ee/record=b2540604*est