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Büyüköztürk et al.
Shejkin et al. , Struktura, prochnost i treshinostojkost cementnogo kamnya, Strojizdat, Moskva, 1974
Plugin et al. 
Kurushin et al. 
Ovcharenko et al. 

For instance, Madueke et al. [14] showed that snail shell particles improved the mechanical properties of unsaturated polyester.
Similarly, Atuanya et al. [15] also reported an improvement in the tensile and flexural properties of recycled low density polyethylene with the addition of snail shell.
Oladele et al. [16] pointed out that snail shell particles below 75µm can be used to develop low-cost epoxy bio-composite with enhanced wear and mechanical properties while particles above this size are only good in enhancing wear properties.
Joseph et al. [17] showed that the tensile properties of reinforced sisal fibre composite varied with fiber content.
El-wazery, Mechanical characteristics and novel applications of hybrid polymer composites- a review, J. of Mat. and Env.

According to Yang et al.[17] the air can catalytically be separated into its pure components namely 78.1% nitrogen, ~21% oxygen, ~0.9% argon, and its trace constituents (Helium, neon, krypton and xenon).
[15] Bala E, Momoh OR, Aderemi BO, El-Yakubu BJ.
Available from: https://pubs.acs.org/sharingguidelines [19] Ben-Mansour R, Habib MA, Bamidele OE, Basha M, Qasem NAA, Peedikakkal A, et al.
[23] Hsueh MH, Wang CN, Hsieh MC, Lai CJ, Wang SH, Hsieh CH, et al.
[25] Catalysts SZ, Martens JA, Cauvel A, Francis A, Jayat F, Remy M, et al.

Okoli et al. [75] compared both methods in the synthesis of magnetite.
An interesting study was conducted by Riccardo et al. [138].
El-Alaily, M.K.
El-Nimr, S.A.
Lu, E.L.

Khan et al. [2] analyzed the effects of solar radiation and chemical reaction on entropy generation of nanofluid flow over a stretching sheet by using the shooting method.
Heat transfer fluids including the suspensions of nanoparticles (Al, Cu, Al203, CuO, silica, carbon nanotubes, etc.) [9].
The work of Malik et al.[12] has had a significant impact on recent advances in nanofluid preparations and their potential future applications in a variety of areas.
El-Aziz and A.
Al-Lawatia, Heat transfer in micropolar fluid along an inclined permeable plate with variable fluid properties, International Journal of thermal sciences. 49 (2010) 993-1002

According to Hess et al. [10], the integration and the exploitation of digital technologies represent one of the biggest challenges that companies have to face.
According to Liere-Netheler et al. [12], these enabling factors can be classified into external, organizational and individual.
Henriette et al. [17] state that the obstacles to digitalization can be strategic, organizational and cultural.
Finally, Liere-Netheler et al. [12] propose a further challenge, namely high capital expenditures.
Syst. 28, 118–144 (2019). https://doi.org/10.1016/J.JSIS.2019.01.003 [9] Bharadwaj, A., El Sawy, O.A., Pavlou, P.A., Venkatraman, N.: Digital Business Strategy: Toward a Next Generation of Insights.

Pal et al in their study reported that caries-free children had higher sIgA level than caries children [17], indicating the effective defense function of sIgA in caries-free individuals [18].
Research of Shifa et.al (2008) [29] and Koga et.al (2004) [30] reported another thing that there was no difference in sIgA level between caries-free and ECC children (p> 0.05).
[18] Heigetyan AV, Bragin EA, Maksiukov SY, Labushkina AV, Alutina EL, Harseeva GG, 2015.
[22] Moslemi M, Sattari M, Kooshki F,Fotuhi F, Modarresi N, Sadrabad ZK, et.al., 2015.
Challenges to improvement of or al health in the 21st century -The approach of the WHO global oral health programme.

Molokov et al.
[19] Mechighel, F.; El Ganaoui, M.; Kadja, M.; Pateyron, B.; Dost, S. (2009): Numerical Simulation of Three Dimensional Low Prandtl Liquid Flow in a Parallelepiped Cavity Under an external Magnetic Field, FDMP: Fluid Dynamics & Materials Processing, vol. 5, no. 4, pp. 313-330
[45] Mechighel, F.; Dost, S.; El Ganaoui, M. (2018): Modeling and numerical simulations of convective melt flow driven by the combined effects of buoyancy, surface tension and magnetic body forces by using two conceptual different models, ICOME 2018 Conference, San Sebastian, Spain April/May 2018

El-Habrouk, M.
El-Hawary, Understanding FACTS: concepts and technology of flexible AC transmission systems vol. 1: IEEE press New York, 2000
Al-Haddad, and A.

As seen, direct quenching from 770 oC resulted in the increased yield strength (811 MPa) while the ductility was decreased (total elongation (EL) is 13 %).
Wu, Effect of matrix structures on TRIP effect and mechanical properties of low-C low-Si Al-added hot-rolled TRIP steels, Mater.
Krizan, Fatigue behavior and retained austenite transformation of Al-containing TRIP steels.
Matlock, E.De Moor, Prediction of tensile properties of intercritically annealed Al-containing 0.19C–4.5Mn (wt%) TRIP steels, Mater.
Zhu, Element partitioning effect on microstructure and mechanical property of the micro-laminated Fe–Mn–Al–C dual phase steel, Mater.