{ "table_of_contents": [ { "title": "A continuum mechanics \nbased four-node shell \nelement for general non-\nlinear analysis", "heading_level": null, "page_id": 0, "polygon": [ [ 41.10205078125, 43.580078125 ], [ 265.0740051269531, 43.580078125 ], [ 265.0740051269531, 121.834228515625 ], [ 41.10205078125, 121.834228515625 ] ] }, { "title": "ABSTRACT", "heading_level": null, "page_id": 0, "polygon": [ [ 43.43408203125, 256.546875 ], [ 101.08760833740234, 256.546875 ], [ 101.08760833740234, 268.6048583984375 ], [ 43.43408203125, 268.6048583984375 ] ] }, { "title": "INTRODUCTION", "heading_level": null, "page_id": 0, "polygon": [ [ 43.142578125, 371.95489501953125 ], [ 129.7071075439453, 371.95489501953125 ], [ 129.7071075439453, 382.8448791503906 ], [ 43.142578125, 382.8448791503906 ] ] }, { "title": "BASIC CONSIDERATIONS", "heading_level": null, "page_id": 0, "polygon": [ [ 306.37060546875, 273.814453125 ], [ 437.2473449707031, 273.814453125 ], [ 437.2473449707031, 284.92486572265625 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