no. 1
The scheme of morphisms from an elliptic curve to a Grassmannian
Compositio Mathematica, Tome 63 (1987) no. 1, pp. 15-40. 
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     author = {Brugui\`eres, A.},
     title = {The scheme of morphisms from an elliptic curve to a {Grassmannian}},
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     pages = {15--40},
     publisher = {Martinus Nijhoff Publishers},
     volume = {63},
     number = {1},
     year = {1987},
     mrnumber = {906377},
     zbl = {0664.14005},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1987__63_1_15_0/}
}
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Bruguières, A. The scheme of morphisms from an elliptic curve to a Grassmannian. Compositio Mathematica, Tome 63 (1987) no. 1, pp. 15-40. http://archive.numdam.org/item/CM_1987__63_1_15_0/

[A] M.F. Atiyah: Vector Bundles over an Elliptic Curve. Proc. Lond. Math. Soc. (3) VII 17 (1957) 414-452. | MR | Zbl

[A1] M.F. Atiyah: On the Krull-Schmidt Theorem with Applications to Sheaves. Bull. Soc. Math. France 84 (1956) 307-317. | Numdam | MR | Zbl

[B] A. Bruguières: Filtration de Harder-Narasimhan et stratification de Shatz. In: Module fibrés stables sur les courbes algébriques, Progress in Mathematics. Birkhâuser (1983). | MR | Zbl

[B1] A. Bruguières: Le schéma des morphismes d'une courbe elliptique dans une grassmannienne, thèse de 3è cycle. Université Paris 7 (1984).

[G] A. Grothendieck: Techniques de construction en géométrie algébrique, Séminaire Bourbaki, exposé 221. | Numdam

[H] R. Hartshorne, Algebraic Geometry. Springer-Verlag (1977). | MR | Zbl

[He] R. Hernandez: On a Harder-Narasimhan Stratification. Preprint.

[O] T. Oda: Vector Bundles on an Elliptic Curve. Nagoya Math. Jour. 43 (1971) 41-72. | MR | Zbl

[S] C.S. Seshadri: Fibrés Vectoriels sur les Courbes Algébriques (rédigé par J.-M. Drézet). Astérisque 96 (1982). | Numdam | MR | Zbl

[Sh] S. Shatz: The Decomposition and Specialization of Algebraic Families of Vector Bundles. Comp. Math. 35 (2) (1977) 163-187. | Numdam | MR | Zbl

[V] J.-L. Verdier: Two-dimensional σ-models and Harmonic Maps S2 → S2n. In: Grouptheoretical Methods in Physics, Lecture Notes in Physics 180. Springer-Verlag. | Zbl