no. 3
On centroids of generalized regular rings
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 26 (1972) no. 3, pp. 573-585. 
@article{ASNSP_1972_3_26_3_573_0,
     author = {Lang, Norman},
     title = {On centroids of generalized regular rings},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {573--585},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 26},
     number = {3},
     year = {1972},
     mrnumber = {360680},
     zbl = {0261.16009},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1972_3_26_3_573_0/}
}
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Lang, Norman. On centroids of generalized regular rings. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 26 (1972) no. 3, pp. 573-585. http://archive.numdam.org/item/ASNSP_1972_3_26_3_573_0/

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