The specific 274-page OCR version you are looking for is primarily hosted on document-sharing sites:
: Hosts a PDF titled "Defensa Siciliana: Kasparov y Nikitin" available for online reading or download. The specific 274-page OCR version you are looking
The book by Garry Kasparov and Alexander Nikitin, published by Editorial Fundamentos in 1987, is available for online viewing or download through several digital document platforms. Digital Availability published by Editorial Fundamentos in 1987