Morse Programs: A Topological Approach to Smooth Constrained Optimization. - Okitsugu Fujiwara (Math. Oper. Res., 1982)

A Note on Differentiability of Global Optimal Values. - Okitsugu Fujiwara (Math. Oper. Res., 1985)

Decision making, models and algorithms: A first course, by Saul I. Gass, John Wiley & Sons, New York, 1985, 412 pp. - Okitsugu Fujiwara (Networks, 1986)

Approximate solutions of capacitated fixed-charge minimum cost network flow problems. - Do Ba Khang; Okitsugu Fujiwara (Networks, 1991)

An optimal (Q, r) policy for a multipart assembly system under stochastic part procurement lead times. - Okitsugu Fujiwara; Dayani Sedarage (Eur. J. Oper. Res., 1997)

Determining optimal order splitting and reorder level for N-supplier inventory systems. - Dayani Sedarage; Okitsugu Fujiwara; Huynh Trung Luong (Eur. J. Oper. Res., 1999)

Optimality of Myopic Ordering Policies for Inventory Model with Stochastic Supply. - Do Ba Khang; Okitsugu Fujiwara (Oper. Res., 2000)

Fund allocation model for pipe repair maintenance in water distribution networks. - Huynh Trung Luong; Okitsugu Fujiwara (Eur. J. Oper. Res., 2002)