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[1] O. Borůvka: Linear Differential Transformations of the Second Order. The English Univ. Prеss, London, 1971. MR 0463539
[2] O. Бopyвкa: Teopuя глoбaльныx cвoйcmв oбыкнoвeнныx лuнeйныx дuффepeнцuaльныx ypaeнeный вmopoгo nopядкa. Диффеpенциaльные ypaвнения, No 8, т. XII, 1976, 1347-1383.
[3] O. Borůvka: Lectures at the seminar of the Institute of Mathematics of the Czechoslovak Academy of Science in Brno.
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