no. 2
On 𝔭-equations and normal extensions of finite 𝔭-type. (II) The analogy of the Riemann’s problem
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 18 (1964) no. 2, pp. 187-200. 
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     author = {Morikawa, Hisasi},
     title = {On $\mathfrak {p}$-equations and normal extensions of finite $\mathfrak {p}$-type. {(II)} {The} analogy of the {Riemann{\textquoteright}s} problem},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {187--200},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 18},
     number = {2},
     year = {1964},
     mrnumber = {169850},
     zbl = {0132.02601},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1964_3_18_2_187_0/}
}
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Morikawa, Hisasi. On $\mathfrak {p}$-equations and normal extensions of finite $\mathfrak {p}$-type. (II) The analogy of the Riemann’s problem. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 18 (1964) no. 2, pp. 187-200. http://www.numdam.org/item/ASNSP_1964_3_18_2_187_0/

[1] Morikawa H., On p-equations and normal extensions of finite p-type I, J. Math. Kyoto Univ. 2-3 (1963). | MR | Zbl

[2] Schlesinger L., Handbuch der Theorie der Linearen Differentialgleichengen Leipzig (1898). I, II4, II2. | JFM

[3] Witt E., Zyklische Korper and Algebren der Characteristik p von Grad pn, J. reine und angew. Math. Band 176 (1937) p. p. 126-140. | JFM | Zbl