Numerical isotonies of preordered semigroups through the concept of a scale. Bosi, Gianni; Campión, María Jesús; Candeal, Juan Carlos; Induráin, Esteban; Zuanon, Magalí E. — 2005 Mathematica Pannonica
On the structure of homoethic functions. (Summary). Juan Carlos Candeal; Esteban Indurain — 1993 Aequationes mathematicae