Voir la notice de l'article provenant de la source Mathematicac Balkanica website
@article{MABA_1999_13_1-2_a1, author = {Yu. Pesheva}, title = {Necessary {Optimality} {Conditions} for {Systems} of {Neutral} {Type} {Obtained} by a {Special} {Variation}}, journal = {Mathematica balkanica}, pages = {7}, publisher = {mathdoc}, volume = {13}, number = {1-2}, year = {1999}, url = {http://geodesic.mathdoc.fr/item/MABA_1999_13_1-2_a1/} }
Yu. Pesheva. Necessary Optimality Conditions for Systems of Neutral Type Obtained by a Special Variation. Mathematica balkanica, Tome 13 (1999) no. 1-2, p. 7. http://geodesic.mathdoc.fr/item/MABA_1999_13_1-2_a1/