Author: Smith, L. Language: English Type: Ph.D dissertation Pagination: 227 Series: Source: Date of publication: 1986 Place of publication: Publisher: Notes:
Author: Penkov, Dimo Krustev Language: Russian Type: Book Pagination: 227 Series: Source: Date of publication: 2009 Place of publication: Sofiia Publisher: Artgraf Izdatelstvo Notes: