Higher-order and mixed discrete derivatives such as a novel graph-theoretical invariant for generating new molecular descriptors

Oscar Martínez-Santiago, Yovani Marrero-Ponce, Ricardo Vivas-Reyes, Mauricio E.O. Ugarriza, Elízabeth Hurtado-Rodríguez, Yoan Martínez-López, F. Javier Torres, Cesar H. Zambrano, Hai Pham-The