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[1] Borůvka O.: Linear Differential Transformations of the Second Order. The English Univ. Pгess, London, 1971. MR 0463539
[2] Бopyвкa O.: Teopия глoбaльныx cвoйcтв oбыкнoвeнныx лuнeйныx диффepeнциaлъныx ypaвнeний втopoгo nopядкa. Диффepeнциaльныe ypaвнeния, Но. 8, т. 12, 1976, 1347-1383.
[3] Boгůvka O.: Lectures at the seminar of the Institute of Mathematics of the Czechoslovak Academy of Science in Brno.
[4] Laitoch M.: Homogene lineare zu sich selbst begleitende Differentialgleichung zweiter Ordnung. Acta Univ. Palackianae Olomucensis FRN, 33, 1971, 61-72. MR 0320410 | Zbl 0298.34006
[5] Stanӗk S.: On a structure of the intersection of the set of dispersions of two second-order linear differential equations. Acta Univ. Palackianae Olomucensis, FRN, т. 73, 1982, 79-85. MR 0702610
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