@article{700146,
     title = {On Gel'fand's method of chasing for solving multipoint boundary value problems},
     booktitle = {Equadiff 6},
     series = {GDML\_Books},
     publisher = {J. E. Purkyn\v e University, Department of Mathematics},
     address = {Brno},
     year = {1986},
     pages = {[267]-274},
     mrnumber = {MR0877135},
     zbl = {0598.65062},
     url = {http://dml.mathdoc.fr/item/700146}
}

Agarwal, Ravi P. On Gel'fand's method of chasing for solving multipoint boundary value problems, dans Equadiff 6, GDML_Books,  (1986), pp. [267]-274. http://gdmltest.u-ga.fr/item/700146/