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[1] Borůvka O.: Linear Differential Transformations of the Second Order. The English Universities Press, London, 1971. MR 0463539
[2] Бopyвкa O.: Teopuя глoбaлъныx cвoйcmв oбыкнoвeнныx лuнeйныx дuффepeнцuaлъныx ypaвнeнuй вmopoгo nopядкa. Диффepeнциaльныe ypaвнeния No 8, т. XII, 1976, 1347-1383.
[3] Haгtman P.: Ordinary Differential Equations. (In Russian) Moscow, 1970.
[4] Xapacaxaл B. X.: Пoчmu-nepuoдuчecкue peчeнuя loбыкнoвeнныx дuффepeнцuaльныx ypaвнeнuй. Издaтeльcтвo „Hayкa", Aлмa-Aтa, 1970.
[5] Maгkus L., Mooгe R. A.: Oscillation and disconjugacy for linear differential equations with almost periodic coefficients. Acta Math., 96, 1956, 99-123. MR 0080813
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