Kwok, SunLangill, Philip P.2005-07-292005-07-291994Langill, P. P. (1994). The circumstellar dust shells of proto-planetary nebulae (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/114680315993944http://hdl.handle.net/1880/30195Bibliography: p. 226-237.xxi, 268 leaves ; 30 cm.engUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.QB 792 L36 1994Circumstellar matterPlanetary nebulaeAstronomical photometrydoctoral thesis10.11575/PRISM/11468QB 792 L36 1994