L. Kollros

An Attempt to determine the twenty-seven Lines upon a Surface of the third Order, and to divide such Surfaces into Species in Reference to the Reality of the Lines upon the Surface

L. Kollros, L. Kollros, 1953 .

On the Distribution of Surfaces of the Third Order into Species, in reference to the absence or presence of Singular Points, and the reality of their Lines

L. Kollros, L. Kollros, 1953 .