@article{10_4064_cm_60_61_2_525_535,
     author = {William C. Connett and Alan L. Schwartz},
     title = {Positive product formulas and hypergroups associated with singular {Sturm-Liouville} problems on a compact interval},
     journal = {Colloquium Mathematicum},
     pages = {525--535},
     publisher = {mathdoc},
     volume = {60},
     number = {2},
     year = {1990},
     doi = {10.4064/cm-60-61-2-525-535},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-60-61-2-525-535/}
}