1. On Hill's method in the theory of linear differential equations with periodic coefficients;Valeev;Prikladnaya Matematika i Mekhanika,1960
2. On Hill's method in the theory of linear differential equations with periodic coefficients. Determination of the characteristic exponents;Valeev;Prikladnaya Matematika i Mekhanika,1961
3. On the danger of combination resonances;Valeev;Prikladnaya Matematika i Mekhanika,1963
4. On the parametric excitation of a dynamic system having multiple degrees of freedom;Hsu;Journal of Applied Mechanics,1963
5. Further results on parametric excitation of a dynamic system;Hsu;Journal of Applied Mechanics,1965