1978 August    QST                                     p. 18
               Simple Ladder I-F Filter

     December  QST                                     p. 22
               Some Experiments with High-Frequency 
               Ladder Crystal Filters

1980 September QST                                     p. 29
               What is a Filter?

     November  QST                                     p. 20
               Ladder Crystal Filter Design

1981 May       QST                                     p. 18
               Crystal Filter Design with Small
               Computers

     October   QST                                     p. 38
               Beating Rotten QRM - CW Filtering for
               the Beginner

     November  QST                                     p. 22
               New Selectivity for Old Receivers

1982 May       QST                                     p. 21
               A Unified Approach to the Design of     7 pages
               Crystal Ladder Filters

1987 July      QST                                     p. 24
               Designing and Building Simple Crystal   5 pages
               Filters
1987 July      QST                                     p. 24
               Designing and Building Simple Crystal   5 pages
               Filters