"Accretion disks"@en . . . "Accretion"@en . "Stars variables T Tauri"@en . "Protoplanetary disks"@en . "Herbig Ae/Be"@en . "Gangi" . . <0000-0002-8364-7795> . "M. Gangi" . "M." . "Stars pre-main sequence"@en .