Ramler, O. J. (1930). “The Orthopole Loci of Some One-Parameter Systems of Lines Referred to a Fixed Triangle”. The American Mathematical Monthly37 (3): 130–136. doi:10.2307/2299415. JSTOR2299415.
Ramler, O. J. (1930). “The Orthopole Loci of Some One-Parameter Systems of Lines Referred to a Fixed Triangle”. The American Mathematical Monthly37 (3): 130–136. doi:10.2307/2299415. JSTOR2299415.