@article{PORMA_1972__31_3_115171,
     author = {Huffstutler, R.G. and Smith, L.D. and Liu, Ya Yin},
     title = {Criterion for the polynomial solutions of certain first order differential equations},
     journal = {Portugaliae mathematica},
     pages = {139--145},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {1972},
     mrnumber = {0301264},
     zbl = {0242.34001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1972__31_3_115171/}
}