Today is .

• "On the Parametric Linear Complementarity Problem", Journal of Optimization Theory and Applications, Vol. 95, No.2, November 1997.
  
  
• "A Note on E-Matrices", Linear Algebra and Its Applications, Vol. 259, July 1, 1997.
  
  
• "Q-Matrices and Boundedness of Solutions to Linear Complementarity Problems," Journal of Optimization Theory and Applications, Vol. 83, No.2, 1994.
  
  
• "On a Class of Semimonotone Q0-Matrices in the Linear Complementarity Problem", Operations Research Letters, Vol. 13, No. 2, 1993.
  
  
• "Some Properties of Explicitly Quasiconcave Functions", Journal of Optimization Theory and Applications, Vol. 74, No. 3, 1992.
  
  
• "A Top-Down Multiregional Econometric Model of the Philippines", Philippine Review of Economics and Business, Vol. 29, No. 1, 1992.
  
  
• "A Top-Down Econometric Model for a Philippine Region", Philippine Review of Economics and Business, Vol. 28, No. 2, December, 1991.
  
  
• "Operations Research", Philippine Science Encyclopedia: Mathematics and Physical Sciences, National Research Council of the Philippines, 1991.
  
  
• "Strict Convexity of the Upper Level Sets of Strictly Quasiconcave Functions", Philippine Review of Economics and Business, Vol. 27, No. 1, June, 1990
  
  
• "Regression by Minimum Sum of Absolute Errors: A Note on Perfect Multicollinearity", Philippine Review of Economics and Business, Vol. 20, No. 1, March 1983
  
  
• "On the Use of Linear Programming for Family Planning Resource Allocation", Philippine Review of Economics and Business, Vol. 19, 1982
  
  
• "Nonnegative Approximate Solutions to an Econometric Model with Prescribed Goals", Philippine Review of Economics and Business, Vol. 18, Nos. 1 and 2, 1981
  
  
• "Research in Mathematics", Guide to Research and Scientific Reporting, S. De Leon and V.S. Claudio (eds), Manila: Merriam School and Office Supplies Corp., 1980
  
  

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