no. 1
Some more Steinhaus type theorems over valued fields
Annales mathématiques Blaise Pascal, Tome 6 (1999) no. 1, pp. 47-54. 
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     title = {Some more {Steinhaus} type theorems over valued fields},
     journal = {Annales math\'ematiques Blaise Pascal},
     pages = {47--54},
     publisher = {Laboratoires de Math\'ematiques Pures et Appliqu\'ees de l'Universit\'e Blaise Pascal},
     volume = {6},
     number = {1},
     year = {1999},
     mrnumber = {1693130},
     zbl = {0943.47058},
     language = {en},
     url = {http://archive.numdam.org/item/AMBP_1999__6_1_47_0/}
}
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Natarajan, P.N. Some more Steinhaus type theorems over valued fields. Annales mathématiques Blaise Pascal, Tome 6 (1999) no. 1, pp. 47-54. http://archive.numdam.org/item/AMBP_1999__6_1_47_0/

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[3] I.J. Maddox, On theorems of Steinhaus type, J. London Math. Soc. 42 (1967), 239-244. | MR | Zbl

[4] P.N. Natarajan, The Steinhaus theorem for Toeplitz matrices in non-archimedean fields, Comment. Math. Prace Mat. 20 (1978), 417-422. | MR | Zbl

[5] P.N. Natarajan, Some Steinhaus type theorems over valued fields, Ann. Math. Blaise Pascal 3 (1996), 183-188. | Numdam | MR | Zbl

[6] M. Stieglitz, H. Tietz, Matrix transformationen von Folgenräumen Eine Ergebnisübersicht, Math. Z. 154 (1977), 1-16. | MR | Zbl