Oscillation theorems for a class of linear fourth order differential equations

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1. Ján Regenda, Oscillation criteria for differential equation $y^{\left(4\right)}+P\left(t\right)y^{\text{'}\text{'}}+R\left(t\right)y^{\text{'}}+Q\left(t\right)y=0$
2. Valter Šeda, On a class of linear $n$-th order differential equations