{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,27]],"date-time":"2025-10-27T20:34:56Z","timestamp":1761597296272},"publisher-location":"Vienna","reference-count":3,"publisher":"Springer Vienna","isbn-type":[{"type":"print","value":"9783211829714"},{"type":"electronic","value":"9783709165102"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1997]]},"DOI":"10.1007\/978-3-7091-6510-2_4","type":"book-chapter","created":{"date-parts":[[2011,7,4]],"date-time":"2011-07-04T11:31:40Z","timestamp":1309779100000},"page":"54-69","source":"Crossref","is-referenced-by-count":10,"title":["Fork Algebras"],"prefix":"10.1007","author":[{"given":"Armando","family":"Haeberer","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcelo","family":"Frias","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gabriel","family":"Baum","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paulo","family":"Veloso","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","reference":[{"key":"4_CR1","unstructured":"It is important to remark that proper fork algebras are quasi-concrete structures, since, as was pointed out by Andr\u00e9ka and N\u00e9meti in a private communication, concrete structures must be fully characterized by their underlying domain, which does not happen with proper fork algebras because of the (hidden) operation \u22c6."},{"key":"4_CR2","unstructured":"Along the next theorems, by S we denote the operation of taking subalgebras of a given class of algebras. P takes direct products of algebras in a given class, and I takes isomorphic copies."},{"key":"4_CR3","unstructured":"Notice that this formula has four variables ranging over individuals."}],"container-title":["Relational Methods in Computer Science"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/link.springer.com\/content\/pdf\/10.1007\/978-3-7091-6510-2_4.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2020,11,23]],"date-time":"2020-11-23T09:45:29Z","timestamp":1606124729000},"score":1,"resource":{"primary":{"URL":"http:\/\/link.springer.com\/10.1007\/978-3-7091-6510-2_4"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1997]]},"ISBN":["9783211829714","9783709165102"],"references-count":3,"URL":"https:\/\/doi.org\/10.1007\/978-3-7091-6510-2_4","relation":{},"subject":[],"published":{"date-parts":[[1997]]}}}