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[1] O. Borůvka: Linear differential transformations of the second order. The English Universities Press, London 1971. MR 0463539
[2] O. Бopyвкa: Teopuя глoбaлъныx cвoйcmв oбыкнoвeнныx лuнeйныx дuффepeнцuaлъныx ypaвнeнuй вmopoгo nopядкa. Диффepeнциaльныe ypaвнeния, No 8, т. ХII, 1976, 1347-1383.
[3] S. Staněk: Phase and dispersion theory of the differential equation y" = q(t)y in connection with the generalized Floquet theory. Arch. Math. (Brno), XIV, 2, 1978, 109-122. MR 0512750
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