@article{Ene98, 
    title = {On Complexity of Reachability of Transition Restricted Petri Nets }, 
    author = {Ene, Cristian},
    year = {1998},
    journal = {Sci. Ann. Cuza Univ.},
    pages = {103-106},
    volume = {7},
    team = {DCS,PACSS},
}