@article{10_1017_S0017089520000087,
     author = {CHAN, CHI-HUA and HUANG, PO-CHUN},
     title = {ON {THE} {EIGENVALUES} {AND} {THE} {NODAL} {POINTS} {OF} {THE} {EIGENFUNCTIONS} {OF} {SOME} {EIGENVALUE} {PROBLEMS} {WITH} {EIGENPARAMETER-DEPENDENT} {BOUNDARY} {CONDITIONS}},
     journal = {Glasgow mathematical journal},
     pages = {158--178},
     year = {2021},
     volume = {63},
     number = {1},
     doi = {10.1017/S0017089520000087},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089520000087/}
}