TY  - JOUR 
T1  - THE GUIDE TO NP-COMPLETENESS IS 40 YEARS OLD: AN HOMAGE TO DAVID S. JOHNSON
JO  - Pesquisa Operacional
A1  - Buriol, Luciana S.
A1  - Figueiredo, Celina
A1  - Resende, Mauricio G. C.
A1  - Uchoa, Eduardo
SN  - 0101-7438
UL  - 10.1590/0101-7438.2020.040.00236329
VL  - 40 
Y1  - 2020
PB  - Brasil 
ER  -