@article{10_1017_S0017089505002351,
     author = {NIESZPORSKI, M. and SANTINI, P.M.},
     title = {THE {SELF-ADJOINT} {5-POINT} {AND} {7-POINT} {DIFFERENCE} {OPERATORS,} {THE} {ASSOCIATED} {DIRICHLET} {PROBLEMS,} {DARBOUX} {TRANSFORMATIONS} {AND} {LELIEUVRE} {FORMULAE}},
     journal = {Glasgow mathematical journal},
     pages = {133--147},
     year = {2005},
     volume = {47},
     number = {A},
     doi = {10.1017/S0017089505002351},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089505002351/}
}