Geodesic
On an optimization problem described by some integral equations
Acta Universitatis Lodziensis. Folia Mathematica, Tome 02 (1987) 
Pelczewski, Jerzy. On an optimization problem described by some integral equations. Acta Universitatis Lodziensis. Folia Mathematica, Tome 02 (1987). http://geodesic.mathdoc.fr/item/AULFM_1987_02_a3/
@article{AULFM_1987_02_a3,
     author = {Pelczewski, Jerzy},
     title = {On an optimization problem described by some integral equations},
     journal = {Acta Universitatis Lodziensis. Folia Mathematica},
     year = {1987},
     volume = {02},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/AULFM_1987_02_a3/}
}
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%J Acta Universitatis Lodziensis. Folia Mathematica
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The paper gives the necessary condition of optimality in the case where the optimization problem is described by some integral equations.