Simplified Design of Impedance-Matching Networks, Part I of III by George Grammer W1DF. March 1957 QST p.38-42.
Simplified Design of Impedance-Matching Networks, Part II of III by George Grammer W1DF. April 1957 QST p. 32-35.
Simplified Design of Impedance-Matching Networks, Part III of III by George Grammer WDF. May 1957 QST p. 38-42.