@article{RSMUP_1992__88__25_0,
     author = {Smith, Howard},
     title = {On subnormal series with factors of finite rank : the join problem},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {25--33},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {88},
     year = {1992},
     mrnumber = {1209114},
     zbl = {0785.20019},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1992__88__25_0/}
}