@article{NSJOM_2000_30_3a_0,
     author = {N. 

 Ad\v{z}i\'c},
     title = {Spectral approximation and nonlocal boundary value problems},
     journal = {Novi Sad Journal of Mathematics},
     pages = {1-10},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {2000},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2000_30_3a_0/}
}