@article{RSMUP_1994__91__225_0,
     author = {Spiezia, Lucia Serena},
     title = {A property of the variety of {2-Engel} groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {225--228},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {91},
     year = {1994},
     mrnumber = {1289638},
     zbl = {0816.20027},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1994__91__225_0/}
}