@article{700062,
     title = {Three-point boundary value problem in a differential equation of the third order},
     booktitle = {Proceedings of Equadiff III},
     series = {GDML\_Books},
     publisher = {Univ. J. E. Purkyn\v e - P\v r\'\i rodov\v edeck\'a fakulta},
     address = {Brno},
     year = {1973},
     pages = {115-118},
     mrnumber = {MR0350099},
     zbl = {0324.34013},
     url = {http://dml.mathdoc.fr/item/700062}
}

Greguš, Michal. Three-point boundary value problem in a differential equation of the third order, dans Proceedings of Equadiff III, GDML_Books,  (1973), pp. 115-118. http://gdmltest.u-ga.fr/item/700062/