Nilpotent groups of class two that can appear as central quotient groups
Rendiconti del Seminario Matematico della Università di Padova, Tome 84 (1990), pp. 241-248. 
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     author = {Heineken, Hermann},
     title = {Nilpotent groups of class two that can appear as central quotient groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {241--248},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {84},
     year = {1990},
     mrnumber = {1101296},
     zbl = {0722.20011},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1990__84__241_0/}
}
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Heineken, Hermann. Nilpotent groups of class two that can appear as central quotient groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 84 (1990), pp. 241-248. http://www.numdam.org/item/RSMUP_1990__84__241_0/

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[3] A.L. Wishnevetskii, Groups of class 2 and exponent p with commutator subgroups of order p2, Doklady Akad. Nauk Ukrain. S.S.R. Ser. A, 103, 9 (1980), pp. 9-11 (Russian). | Zbl