@article{DMSMF_2006_2006_1_a0,
     author = {Barsegian, G.},
     title = {An analogue of {Rolle's} theorem for functions
of two variables
},
     journal = {Disertaciones del Seminario de Matem\'aticas Fundamentales},
     pages = {1-6},
     publisher = {mathdoc},
     volume = {38},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMSMF_2006_2006_1_a0/}
}