@article{10_4153_CJM_1970_142_1,
     author = {Lorch, Lee and Muldoon, M. E. and Szego, Peter},
     title = {Higher {Monotonicity} {Properties} of {Certain} {Sturm-Liouville} {Functions.} {III}},
     journal = {Canadian journal of mathematics},
     pages = {1238--1265},
     year = {1970},
     volume = {22},
     number = {6},
     doi = {10.4153/CJM-1970-142-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-142-1/}
}