TY  - DATA
AU  - Albano, Paolo
AU  - Bove, Antonio.
TI  - Wave front set of solutions to sums of squares of vector fields 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9780821894613 (online)
PY  - 2012///];A2012
CY  - Providence, Rhode Island
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/1039
ER  -