@article{ELMA_1980__35_141246,
     author = {Peter L\"auchli},
     title = {Elementarmathematik und {Didaktik.} {Regul\"are} {Kettenbr\"uche} und quadratische diophantische {Probleme.}},
     journal = {Elemente der Mathematik},
     pages = {81--92},
     publisher = {mathdoc},
     volume = {35},
     year = {1980},
     zbl = {0443.10006},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1980__35_141246/}
}