@article{10_4153_CJM_2012_026_7,
     author = {Shemyakova, E.},
     title = {Proof of the {Completeness} of {Darboux} {Wronskian} {Formulae} for {Order} {Two}},
     journal = {Canadian journal of mathematics},
     pages = {655--674},
     year = {2013},
     volume = {65},
     number = {3},
     doi = {10.4153/CJM-2012-026-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2012-026-7/}
}