An improved initial basis for the Simplex algorithm. - Hélcio Vieira Jr.; Marcos Pereira Estellita Lins (Comput. Oper. Res., 2005)

A new DEA ranking system based on changing the reference set. - Gholam Reza Jahanshahloo; Hélcio Vieira Jr.; F. Hosseinzadeh Lotfi; Darush Akbarian (Eur. J. Oper. Res., 2007)

Optimizing Stochastic Functions Using a Genetic Algorithm: An Aeronautic Military Application. - Hélcio Vieira Jr. (Advances in Metaheuristics for Hard Optimization, 2008)

Design and Development of a Simulator for the Brazilian Data Collecting System based on Satellites. - Germano Kienbaum; Felipe Miranda; Joaquim Pedro Barreto; Marcus Vinicius Cisotto; Wanderson Gomes Almeida; Hélcio Vieira Jr. (WSC, 2009)

A WIN-WIN approach to multiple objective linear programming problems. - Hélcio Vieira Jr.; Marcos Pereira Estellita Lins (J. Oper. Res. Soc., 2009)

Multinomial Selection Problem: A Study of BEM and AVC Algorithms. - Hélcio Vieira Jr.; Karl Heinz Kienitz; Mischel Carmen Neyra Belderrain (Commun. Stat. Simul. Comput., 2010)

Discrete-valued, stochastic-constrained simulation optimization with compass. - Hélcio Vieira Jr.; Karl Heinz Kienitz; Mischel Carmen Neyra Belderrain (WSC, 2011)

Improved efficient, nearly orthogonal, nearly balanced mixed designs. - Hélcio Vieira Jr.; Susan M. Sanchez; Karl Heinz Kienitz; Mischel Carmen Neyra Belderrain (WSC, 2011)

Generating and improving orthogonal designs by using mixed integer programming. - Hélcio Vieira Jr.; Susan M. Sanchez; Karl Heinz Kienitz; Mischel Carmen Neyra Belderrain (Eur. J. Oper. Res., 2011)

Efficient, nearly orthogonal-and-balanced, mixed designs: an effective way to conduct trade-off analyses via simulation. - Hélcio Vieira Jr.; Susan M. Sanchez; Karl Heinz Kienitz; Mischel Carmen Neyra Belderrain (J. Simulation, 2013)

A restricted multinomial hybrid selection procedure. - Hélcio Vieira Jr.; Susan M. Sanchez; Paul J. Sanchez; Karl Heinz Kienitz; Mischel Carmen Neyra Belderrain (ACM Trans. Model. Comput. Simul., 2014)