Projectivities in finite p-groups
Rendiconti del Seminario Matematico della Università di Padova, Tome 48 (1972), pp. 1-13. 
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     author = {Wehrhahn, Karl H.},
     title = {Projectivities in finite $p$-groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--13},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {48},
     year = {1972},
     mrnumber = {360815},
     zbl = {0355.20030},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1972__48__1_0/}
}
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Wehrhahn, Karl H. Projectivities in finite $p$-groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 48 (1972), pp. 1-13. http://archive.numdam.org/item/RSMUP_1972__48__1_0/

[1] Jacobson, N.: Lectures in Abstract Algebra, vol. 2, Van Nostrand, 1953. | MR | Zbl

[2] Wehrhahn, K.H.: Projectivities in Finite p-groups I, Math. Zeitschr. (to appear).