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ma-415	doi.org	https://doi.org/10.1007/s11425-006-0639-y
ma-415	doi.org	https://doi.org/10.1007/s10114-016-4617-1[9
ma-415	doi.org	https://doi.org/10.1016/j.jmaa.2012.04.043[11
ma-415	doi.org	https://doi.org/10.1112/blms/5.1.121[12
ma-415	ocu-omu.repo.nii.ac.jp	https://ocu-omu.repo.nii.ac.jp/records/201676[13
ma-415	doi.org	https://doi.org/10.14232/ejqtde.2018.1.82[16
ma-415	doi.org	https://doi.org/10.1186/s13661-018-1116-6[17
ma-415	doi.org	https://doi.org/10.4236/am.2016
ma-415	doi.org	https://doi.org/10.1002/mma.7487[20
ma-415	doi.org	https://doi.org/10.3906/mat-1412-52[21
ma-415	doi.org	https://doi.org/10.3390/math10071168[22
ma-415	doi.org	https://doi.org/10.1007/978-3-0348-0548-3[23
ma-415	doi.org	https://doi.org/10.1007/s12215-010-0034-y[24
ma-415	eudml.org	http://eudml.org/doc/126704[25
ma-415	doi.org	https://doi.org/10.28924/ada/ma.5.22
ma-415	doi.org	https://doi.org/10.1007/s11401-021-0268-3
ma-415	doi.org	https://doi.org/10.1007/s11401-021-0268-3
ma-415	doi.org	https://doi.org/10.1007/s10114-016-4617-1
ma-415	www.utgjiu.ro	https://www.utgjiu.ro/math/sma/v15/v15.html
ma-415	www.utgjiu.ro	https://www.utgjiu.ro/math/sma/v15/v15.html
ma-415	doi.org	https://doi.org/10.1016/j.jmaa.2012.04.043
ma-415	doi.org	https://doi.org/10.1112/blms/5.1.121
ma-415	ocu-omu.repo.nii.ac.jp	https://ocu-omu.repo.nii.ac.jp/records/201676
ma-415	doi.org	https://doi.org/10.1016/j.na.2009.02.075
ma-415	doi.org	https://doi.org/10.1016/j.na.2009.02.075
ma-415	doi.org	https://doi.org/10.14232/ejqtde.2018.1.82
ma-415	doi.org	https://doi.org/10.1186/s13661-018-1116-6
ma-415	doi.org	https://doi.org/10.1016/j.aml.2011.11.022
ma-415	doi.org	https://doi.org/10.1016/j.aml.2011.11.022
ma-415	doi.org	https://doi.org/10.4236/am.2016.710104
ma-415	doi.org	https://doi.org/10.4236/am.2016.710104
ma-415	doi.org	https://doi.org/10.1002/mma.7487
ma-415	doi.org	https://doi.org/10.3906/mat-1412-52
ma-415	doi.org	https://doi.org/10.3390/math10071168
ma-415	doi.org	https://doi.org/10.1007/978-3-0348-0548-3
ma-415	doi.org	https://doi.org/10.1007/s12215-010-0034-y
ma-415	eudml.org	http://eudml.org/doc/126704