A DIRECT METHOD OF OPERATIONAL CALCULUS (Ⅰ)——Research for the solution of second-order linear ordinary differential equations with Variable coefficients
Qiu Lianrong. A DIRECT METHOD OF OPERATIONAL CALCULUS (Ⅰ)——Research for the solution of second-order linear ordinary differential equations with Variable coefficients[J].Acta mathematica scientia,Series B, 1982, 2(4): 389-402.