no. 2
Examples of non-ample normal bundles
Compositio Mathematica, Tome 51 (1984) no. 2, pp. 189-192 
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     author = {Goldstein, Norman},
     title = {Examples of non-ample normal bundles},
     journal = {Compositio Mathematica},
     pages = {189--192},
     year = {1984},
     publisher = {Martinus Nijhoff Publishers},
     volume = {51},
     number = {2},
     mrnumber = {739733},
     zbl = {0543.14025},
     language = {en},
     url = {https://www.numdam.org/item/CM_1984__51_2_189_0/}
}
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Goldstein, Norman. Examples of non-ample normal bundles. Compositio Mathematica, Tome 51 (1984) no. 2, pp. 189-192. https://www.numdam.org/item/CM_1984__51_2_189_0/

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[3] R. Hartshorne: Ample vector bundles. Inst. Hautes Etudes Sci. Publ. Math. 29 (1966) 63-94. | Zbl | MR | Numdam

[4] A. Papantonopoulou: Surfaces in the Grassmann variety G(1, 3). Proc. Amer. Math. Soc. 77 (1979) 15-18. | Zbl | MR