Professor Chigbu has authored and co-authored five books, three book-chapters, four Conference proceedings, three preprints and over forty five articles published in local and international journals. Selected journal articles from the lot are listed as follows:
1. CHIGBU, P.E. (1991) “On optimal placement of the knots of a polynomial spline function under variations of optimality criteria”, Bulletin of International Statistical Institute, Vol. 54 (4B), pp. 515 – 529.
2. Bailey, R.A. & CHIGBU, P.E. (1997) “Enumeration of semi-Latin squares”, Discrete Math., Vol. 167/168, pp. 73 – 84.
3. CHIGBU, P.E. (1998) “Efficiency, efficiency factors and optimality criteria for comparing incomplete-block designs”, Journ. Nig. Stat. Assoc., Vol. 12, pp. 39 – 55.
4. CHIGBU, P.E. (1999) “The block structures and isomorphism of semi-Latin squares and related designs”, Bulletin of the Institute of Combinatorics and its Applications, Vol. 12, pp. 53 – 65.
5. CHIGBU, P.E. & Eze, B.C. (2001) “Automating the group-theoretic-based construction procedure for the (n x n)/k semi-Latin square”, Utilitas Mathematica, Vol. 60, pp. 107 – 123.
6. CHIGBU, P.E. (2003) “The ‘best’ of the three optimal (4x4)/4 semi-Latin squares”, Sankhyā: The Indian Journal of Statistics, Vol. 65, Part 3, pp 641-648.
7. CHIGBU, P.E. & A. Ekpo, (2008) “On the circuits of the three optimal (4x4)/4 semi-Latin square designs”, Journ. Nig. Stat. Assoc., Vol. 20, pp. 1 – 13.
8. CHIGBU, P.E., Ukaegbu, E.C. & Nwanya, J.C. (2009) “On comparing the prediction variances of some central composite designs in spherical regions: a review”, Statistica, anno LXIX, n. 4: 285 - 298.
9. Bassey, K.J. & CHIGBU, P.E. (2012) “On optimal control theory in marine oil spill management: a markovian decision approach”, European Journal of Operational Research, 217: 470 - 478.
10. Iwundu, M. & CHIGBU, P. (2012) “A hill-climbing combinatorial algorithm for constructing n-point D-optimal exact designs”, J. Stat. Appl. Pro. 1, No. 2: 133 – 146.
11. Ukaegbu, E.C. & CHIGBU, P.E. (2012) “Comparison of prediction capabilities of partially replicated central composite designs in cuboidal region”, Communications in Statistics-Theory and Methods, (accepted author version posted online: 28 May 2013).
12. Ohaegbulem, E.U. & CHIGBU, P.E. (2013) “On some elements of restrictions and replications on the central composite designs”, International Journal of Statistics and Applications, 3(5): 188 – 197.
13. Bassey, K. & CHIGBU, P. (2013) “Optimal detection and estimation of marine oil spills through coherent pluralism”, International Journal of Operations Research and Information Systems, 4(1), 84 – 111.
14. Ugbe, T.A. & CHIGBU, P.E. (2014) “On non-overlapping segmentation of the response surfaces for solving constrained programming problems through super convergent line series”, Communications in Statistics - Theory and Methods, 43: 306 - 320.
15. Ukaegbu, E.C. & CHIGBU, P.E. (2014) “Graphical evaluation of the prediction capabilities of partially replicated orthogonal central composite designs”, Quality and Reliability Engineering International, (accepted 3 January 2014 and posted online, March 2014: www.onlinelibrary.wiley.com).
