@article{10_1017_S0017089514000470,
     author = {HEITTOKANGAS, JANNE and REIJONEN, ATTE},
     title = {ON {THE} {COMPLEXITY} {OF} {FINDING} {A} {NECESSARY} {AND} {SUFFICIENT} {CONDITION} {FOR} {BLASCHKE-OSCILLATORY} {EQUATIONS}},
     journal = {Glasgow mathematical journal},
     pages = {543--554},
     year = {2015},
     volume = {57},
     number = {3},
     doi = {10.1017/S0017089514000470},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089514000470/}
}