Córdova Procel, Juan, 		Miño Cascante, Gloria, 		Vargas Guambo, Blanca, AND 		Vega Cortez, Paúl.
" CALCULATION OF THE VARIABLE COST OF WELDING IN API TANK" <em>mktDESCUBRE</em> [Online], Volume 1 Number 2 (30 March 2020)