@article{10_14708_ma_v14i28_1681,
     author = {Jan A. Rempa{\l}a},
     title = {Review: {John} {L.} {Troutman;} {Variational} calculus with elementary convexity},
     journal = {Mathematica Applicanda},
     pages = { 143--150},
     publisher = {mathdoc},
     volume = {14},
     number = {28},
     year = {1986},
     doi = {10.14708/ma.v14i28.1681},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v14i28.1681/}
}