{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T14:41:54Z","timestamp":1773240114330,"version":"3.50.1"},"reference-count":0,"publisher":"European Mathematical Society - EMS - Publishing House GmbH","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Comment. Math. Helv."],"published-print":{"date-parts":[[2015,2,23]]},"abstract":"<jats:p>\n                    We give a new construction of the irregular surfaces of general type with\n                    <jats:inline-formula>\n                      <jats:tex-math>p_g=5, \\chi=2, K^ 2=8<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    ,recently discovered by C. Schoen in [24]. Our approach proves that, if\n                    <jats:inline-formula>\n                      <jats:tex-math>S<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    is a general Schoen surface, its canonical map is a finite morphism of degree 2 onto a canonical surface with invariants\n                    <jats:inline-formula>\n                      <jats:tex-math>p_{g}=5, \\chi=6, \\, K^{2}=8<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    , a complete intersection of a quadric and a quartic hypersurface in\n                    <jats:inline-formula>\n                      <jats:tex-math>\\mathbb P^{4}<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    , with 40 even nodes.\n                  <\/jats:p>","DOI":"10.4171\/cmh\/346","type":"journal-article","created":{"date-parts":[[2015,2,23]],"date-time":"2015-02-23T19:27:04Z","timestamp":1424719624000},"page":"59-74","source":"Crossref","is-referenced-by-count":8,"title":["On Schoen surfaces"],"prefix":"10.4171","volume":"90","author":[{"given":"Ciro","family":"Ciliberto","sequence":"first","affiliation":[{"name":"Universit\u00e0 di Roma, Italy"}]},{"given":"Margarida","family":"Mendes Lopes","sequence":"additional","affiliation":[{"name":"Instituto Superior T\u00e9cnico, Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5935-192X","authenticated-orcid":false,"given":"Xavier","family":"Roulleau","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Poitiers, Futuroscope Chasseneuil, France"}]}],"member":"2673","container-title":["Commentarii Mathematici Helvetici"],"original-title":[],"link":[{"URL":"http:\/\/www.ems-ph.org\/fulltext\/10.4171\/CMH\/346","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,11,6]],"date-time":"2025-11-06T09:12:36Z","timestamp":1762420356000},"score":1,"resource":{"primary":{"URL":"https:\/\/ems.press\/doi\/10.4171\/cmh\/346"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,2,23]]},"references-count":0,"journal-issue":{"issue":"1"},"URL":"https:\/\/doi.org\/10.4171\/cmh\/346","relation":{},"ISSN":["0010-2571","1420-8946"],"issn-type":[{"value":"0010-2571","type":"print"},{"value":"1420-8946","type":"electronic"}],"subject":[],"published":{"date-parts":[[2015,2,23]]}}}