no. 1
On the eta-invariant of Pin + -operator on some exotic 4-dimensional projective space
Compositio Mathematica, Tome 78 (1991) no. 1, pp. 1-27 
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     author = {Oledzki, Wies{\l}aw J.},
     title = {On the eta-invariant of $\mathrm {Pin}^+$-operator on some exotic 4-dimensional projective space},
     journal = {Compositio Mathematica},
     pages = {1--27},
     year = {1991},
     publisher = {Kluwer Academic Publishers},
     volume = {78},
     number = {1},
     zbl = {0725.57017},
     language = {en},
     url = {https://www.numdam.org/item/CM_1991__78_1_1_0/}
}
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Oledzki, Wiesław J. On the eta-invariant of $\mathrm {Pin}^+$-operator on some exotic 4-dimensional projective space. Compositio Mathematica, Tome 78 (1991) no. 1, pp. 1-27. https://www.numdam.org/item/CM_1991__78_1_1_0/

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