@article{10_1017_S0017089505002879,
     author = {CHEN, YUQING and O'REGAN, DONAL},
     title = {GENERALIZED {DEGREE} {THEORY} {FOR} {SEMILINEAR} {OPERATOR} {EQUATIONS}},
     journal = {Glasgow mathematical journal},
     pages = {65--73},
     year = {2006},
     volume = {48},
     number = {1},
     doi = {10.1017/S0017089505002879},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089505002879/}
}