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Issue Date	Title	Author(s)	Publisher
1957	Elliptische Regelscharen in der zweiachsigen Geometrie	*Petkantschin, B.*	Bulgarian Academy of Sciences
1954	Isometrie zwischen zwei mongeschen Flächen	*Petkantschin, B.*	Bulgarian Academy of Sciences
1954	Regelscharen isotroper Geraden im elliptischen Raum	*Petkantschin, B.*	Bulgarian Academy of Sciences
1956	Regelscharen isotroper Geraden in der zweiachsigen Geometrie	*Petkantschin, B.*	Bulgarian Academy of Sciences

Showing results 1 to 4 of 4