Ram U. Verma. “Generalized Higher Order (φ, η, ω, π, ρ, θ, M)-Invexities in Parametric Optimality Conditions for Discrete Minmax Fractional Programming”. Journal of Basic & Applied Sciences, vol. 12, Jan. 2016, pp. 293-00, doi:10.6000/1927-5129.2016.12.45.