Z.M. Abdullah, M. Hameed, M. Hisham and M.A. Khaleel, Modified new conjugate gradient method for Unconstrained Optimization, Tikrit J. Pure Sci. 24(5) (2019) 86–90.
 Z.M. Abdullah, M.A. Khaleel, M.K. Abdal-hameed and P.E. Oguntunde, Estimating parameters for extension of
Burr type X distribution by using conjugate gradient in unconstrained optimization, Kirkuk Univ. J. Sci. Stud.
14(3) (2019) 33–49. M.T. Ahmed, Exponential distribution (Topp Leone Marshall-Olkin) properties with application, Tikrit J. Administ. Econ. Sci. 15(47 Part 2) (2019) 242–255.
 M.T. Ahmed, M.A. Khaleel and E.K. Khalaf, The new distribution (Topp Leone Marshall Olkin-Weibull) properties with an application, Period. Eng. Nat. Sci. 8(2) (2020) 684–692.
 M.T. Ahmed, M.A. Khaleel, P.E. Oguntunde and M.K. Abdal-Hammed, A new version of the exponentiated Burr
X distribution, J. Phys. Conf. Ser. 1818(1) (2021) 012116 .
 V. Chawla, A. Chanda and S. Angra, The scheduling of automatic guided vehicles for the workload balancing
and travel time minimization in the flexible manufacturing system by the nature-inspired algorithm, J. Project
Manage. 4(1) (2019) 19–30.
 J.E. Dennis Jr and R.B. Schnabel, Numerical methods for unconstrained optimization and nonlinear equations,
Society for Industrial and Applied Mathematics, 1996.
 B.K. Faraj and N.K. Hussein, Gray wolf optimization and least square estimatation as a new learning algorithm
for interval type-II ANFIS, Tikrit J. Pure Sci. 24(1) (2019) 107–111.
 L. Handique and S. Chakraborty, A new beta generated Kumaraswamy Marshall-Olkin-G family of distributions
with applications, Malays. J. Sci. 36(3) (2017) 157–174.
 M.A. Khaleel, N.H. Al-Noor and M.K. Abdal-Hameed, Marshall Olkin exponential Gompertz distribution: Properties and applications, Period. Eng. Nat. Sci. 8(1) (2020) 298–312.
 M.A. Khaleel, P.E. Oguntunde, J.N. Al Abbasi, N.A.Ibrahim and M.H. AbuJarad, The Marshall-Olkin Topp
Leone-G family of distributions: A family for generalizing probability models, Sci. Afr. 8 (2020) 00470.
 Y. Li, X. Lin and J. Liu, An improved gray wolf optimization algorithm to solve engineering problems, Sustainability 13(6) (2021) 3208.
 A.P.D.A.A. Mohammad, The Marshall-Olkin Topp Leone flexible Weibull distribution properties with application,
Tikrit J. Administration Econ. Sci. 16(51 part 2) (2020) 499–517.
 P.E. Oguntunde, A.O. Adejumo and E.A. Owoloko, On the flexibility of the transmuted inverse exponential
distribution, World Cong. Engin. 2017.
 P.E. Oguntunde, M.A. Khaleel, A.O. Adejumo, H.I. Okagbue, A.A. Opanuga and F.O. Owolabi, The Gompertz
inverse exponential (GoIE) distribution with applications, Cogent Math. Stat. 5(1) (2018) 1507122.
 P.E. Oguntunde, M.A. Khaleel, H.I. Okagbue and O.A. Odetunmibi, The Topp–Leone Lomax (TLLo) distribution
with applications to airbone communication transceiver dataset, Wireless Pers. Commun. 109(1) (2019) 349–360.
 H. Tomizuka and H. Yabe, A Hybrid Conjugate Gradient Method for Unconstrained Optimization, Department of
Mathematical Information Science, Tokyo University of Science. 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601,
 J.S. Wang and S.X. Li, An improved grey wolf optimizer based on differential evolution and elimination mechanism,
Sci. Rep. 9(1) (2019) 1–21.