@inbook{ ROSALES_GARCÍA:171-180,

author = { JOSE CARLOS ROSALES GONZALEZ and JUAN IGNACIO GARCÍA GARCÍA } ,

title = { GENERALIZED N-SEMIGROUPS },

booktitle = { PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON SEMIGROUPS },

isbn = { 981-02-4392-8 },

publisher = { World Scientific Publishing },

pages = { 171 - 180 },

year = { 2000 },

}