@Article{ VELASCO_BERMÚDEZ:399-406,

author = { JOSEFA VELASCO CABRERA and FRANCISCO JAVIER BERMÚDEZ RODRÍGUEZ } ,

title = { SPHERICAL EQUIVALENT AND ASTIGMATISM },

journal = { ATTI DELLA FONDAZIONE GIORGIO RONCHI },

year = { 1997 },

issn = { 0391-2051 },

pages = { 399-406 },

}