no. 1
The Segre imbedding and its converse
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 5, Tome 7 (1985) no. 1, pp. 1-28 
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     title = {The {Segre} imbedding and its converse},
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Chen, Bang-Yen; Kuan, Wei-Eihn. The Segre imbedding and its converse. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 5, Tome 7 (1985) no. 1, pp. 1-28. https://www.numdam.org/item/AFST_1985_5_7_1_1_0/

[1] B.Y. Chen. «Geometry of Submanifolds». Dekker, New-York, (1973). | Zbl | MR

[2] B.Y. Chen. «CR-submanifolds of a Kaehler manifold, I». J. Differential Geometry, 16 (1981), 305-322. | Zbl | MR

[3] B.Y. Chen and W.E. Kuan. «Sous-variétés produits et plongement de Segre». C.R. Acad. Sc. Paris 296 (1983), 689-690. | Zbl | MR

[4] C. Segre. «Sulle varietà che rappresentano le coppie di punti di due piani o spazi». Rend. Cir. Mat. Palermo 5 (1891), 192-204. | JFM