{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,17]],"date-time":"2025-10-17T13:35:53Z","timestamp":1760708153695,"version":"3.28.0"},"reference-count":9,"publisher":"IEEE","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2009,12]]},"DOI":"10.1109\/cdc.2009.5400489","type":"proceedings-article","created":{"date-parts":[[2010,2,2]],"date-time":"2010-02-02T10:27:26Z","timestamp":1265106446000},"page":"4340-4345","source":"Crossref","is-referenced-by-count":1,"title":["Two-dimensional almost-Riemannian structures with tangency points"],"prefix":"10.1109","author":[{"given":"A.A.","family":"Agrachev","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"U.","family":"Boscain","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"G.","family":"Charlot","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R.","family":"Ghezzi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.","family":"Sigalotti","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"263","reference":[{"key":"ref4","first-page":"19","article-title":"A short introduction to optimal control","author":"boscain","year":"2005","journal-title":"Contr&#x00F4;le Non Lin&#x00E9;aire et Applications"},{"doi-asserted-by":"publisher","key":"ref3","DOI":"10.1007\/978-3-0348-9210-0_1"},{"doi-asserted-by":"publisher","key":"ref6","DOI":"10.1063\/1.1465516"},{"key":"ref5","doi-asserted-by":"crossref","first-page":"957","DOI":"10.3934\/dcdsb.2005.5.957","article-title":"Nonisotropic 3-level quantum systems: complete solutions for minimum time and minimum energy","volume":"5","author":"boscain","year":"2005","journal-title":"Discrete Contin Dyn Syst Ser B"},{"year":"2009","author":"agrachev","article-title":"Trivializable almost-Riemannian structures on compact oriented surfaces","key":"ref8"},{"key":"ref7","doi-asserted-by":"crossref","first-page":"801","DOI":"10.3934\/dcds.2008.20.801","article-title":"A Gauss-Bonnet-like formula on two-dimensional almost-Riemannian manifolds","volume":"20","author":"agrachev","year":"2008","journal-title":"Discrete Contin Dyn Syst"},{"key":"ref2","first-page":"456","article-title":"A certain class of hypoelliptic operators","volume":"83","author":"gru\u0161in","year":"1970","journal-title":"Mat Sb (N S )"},{"key":"ref9","first-page":"41","article-title":"High-order angles in almost-Riemannian geometry","volume":"25","author":"boscain","year":"2008","journal-title":"Actes de S&#x00E9;minaire de Th&#x00E9;orie Spectrale et G&#x00E9;om&#x00E9;tric"},{"key":"ref1","first-page":"105","article-title":"Une m&#x00E9;trique associ&#x00E9;e &#x00E0; une classe d'op&#x00E9;rateurs elliptiques d&#x00E9;g&#x00E9;n&#x00E9;r&#x00E9;s","author":"franchi","year":"1983","journal-title":"conference on linear partial and pseudodifferential operators (Torino 1982)"}],"event":{"name":"2009 Joint 48th IEEE Conference on Decision and Control (CDC) and 28th Chinese Control Conference (CCC)","start":{"date-parts":[[2009,12,15]]},"location":"Shanghai, China","end":{"date-parts":[[2009,12,18]]}},"container-title":["Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference"],"original-title":[],"link":[{"URL":"http:\/\/xplorestaging.ieee.org\/ielx5\/5379695\/5399469\/05400489.pdf?arnumber=5400489","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2017,6,19]],"date-time":"2017-06-19T00:19:40Z","timestamp":1497831580000},"score":1,"resource":{"primary":{"URL":"http:\/\/ieeexplore.ieee.org\/document\/5400489\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,12]]},"references-count":9,"URL":"https:\/\/doi.org\/10.1109\/cdc.2009.5400489","relation":{},"subject":[],"published":{"date-parts":[[2009,12]]}}}