@article{MM2_1984__48_155023,
     author = {Anthony Joseph Tromba},
     title = {Degree {Theory} on {Orientated} {Infinite} {Dimensional} {Varieties} and the {Morse} {Number} of {Minimal} {Surfaces} {Spanning} a {Curve.}},
     journal = {Manuscripta mathematica},
     pages = {139--162},
     publisher = {mathdoc},
     volume = {48},
     year = {1984},
     zbl = {0622.58006},
     url = {http://geodesic.mathdoc.fr/item/MM2_1984__48_155023/}
}