@article{10_1017_S0017089504001983,
     author = {AGARWAL, RAVI P. and O'REGAN, DONAL and STAN\v{E}K, SVATOSLAV},
     title = {POSITIVE {SOLUTIONS} {OF} {NONLOCAL} {SINGULAR} {BOUNDARY} {VALUE} {PROBLEMS}},
     journal = {Glasgow mathematical journal},
     pages = {537--550},
     year = {2004},
     volume = {46},
     number = {3},
     doi = {10.1017/S0017089504001983},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089504001983/}
}