Special Section on Discrete Mathematics and Its Applications
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 . FOREWORD ........................................................ 457
        Kazuo Iwano

PAPERS
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 . Universal Graphs for Graphs with Bounded Path-Width ............. 458
        Atsushi TAKAHASHI, Shuichi UENO and Yoji KAJITANI

 . Optimal Parallel Algorithms for Edge-Coloring Partial k-Trees with
   Bounded Degrees ................................................. 463
        Xiao ZHOU and Takao NISHIZEKI

 . Complexity of Boolean Functions Satisfying the Propagation Criterion
            ........................................................ 470
        Shouichi HIROSE and Katsuo IKEDA

 . Efficient Radix-2 Divider for Selecting Quotient Digit Embedded in
   Partial Remainder Calculation ................................... 479
        Motonobu TONOMURA

Regular Section
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PAPERS
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[Analog Signal Processing]

 . A Unified Analysis of Adaptively Biased Emitter- and Source-Coupled
   Pairs for Linear Bipolar and MOS Transconductance Elements ...... 485
        Katsuji KIMURA

[Nonlinear Problems]

 . Resistively Coupled Wien Bridge Oscillators ..................... 498
        Mozammel HOQUE and Hiroshi KAWAKAMI

[Numerical Analysis and Optimization]

 . Numerical Calculation of the Bessel Function of Complex Order Using
   the Recurrence Method ........................................... 506
        Masao KODAMA

[Graphs and Networks]

 . On an Optimal File Transfer on an Arborescence-Net with Constraints
   on Copying Numbers .............................................. 517
        Yoshihiro KANEKO, Shoji SHINODA and Kazuo HORIUCHI

[Neural Networks]

 . Experimental Observations of 2- and 3-Neuron Chaotic Neural Networks
   Using Switched-Capacitor Chaotic Neuron IC Chip ................. 529
        Yoshihiko HORIO and Ken SUYAMA

LETTERS
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[Acoustic]

 . A Stochastic Evaluation Theory of Arbitrary Acoustic System Response
   and Its Application to Various Type Sound Insulation Systems
   --Equivalence Transformation Toward the Standard Hermite Expansion
   Type Probability Expression-- ................................... 536
        Mitsuo OHTA and Hitoshi OGAWA

[Nonlinear Problems]

 . Controlling the Stability of Resistively Coupled Oscillators .... 541
        Mozammel HOQUE and Hiroshi KAWAKAMI

 . ABSTRACTS (IEICE Trans., Vol.J78-A, No.4 in Japanese) ........... 545