R. M. Y. Conishi and R. R. Gaidzinski, “Evaluation of the Nursing Activities Score (NAS) as a nursing workload measurement tool in an adult ICU”, Rev. Esc. Enferm. USP, vol. 41, no. 3, pp. 346–354, Sep. 2007, doi: 10.1590/S0080-62342007000300002.