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\ref\no 23
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\paper        On fractional powers of Bessel operators
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\paper        A fractional equation with left-sided fractional Bessel derivatives of Gerasimov--Caputo type
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%DOI:  10.3390/math7121216.
			
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\yr             1948
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\ref\no 27
\by          Kilbas~A.A., Srivastava~H.M., and Trujillo~J.J.
\book        Theory and Applications of Fractional Differential Equations
\publaddr    Amsterdam, Boston, and Heidelberg
\publ        Elsevier
\yr          2006
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