Optimization of growth regulators and silver nitrate for micropropagation of Dianthus caryophyllus L. with the aid of a response surface experimental design - Gutiérrez-Miceli, Federico A.; Arias, Lourdes; Juarez-Rodríguez, Nicolás; Abud-Arcilla, Miguel; Amaro-Reyes, Aldo; Dendooven, Luc