@article{RSMUP_2013__129__129_0,
     author = {Denson Hill, C. and Nacinovich, Mauro},
     title = {Non completely solvable systems of complex first order {PDEs}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {129--170},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {129},
     year = {2013},
     mrnumber = {3090635},
     zbl = {1275.35074},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_2013__129__129_0/}
}