Unexpected Ring Closure between Hydrazono and Nitro Groups: A Useful Synthesis of Substituted Pyrazole N-Oxides - Attanasi, Orazio A; Favi, Gianfranco; Filippone, Paolino; Giorgi, Gianluca; Lillini, Samuele; Mantellini, Fabio; Perrulli, Francesca R (Synlett, 2006)