NUMBER 1

1. Tomoaki Ono:
   On the existence of a regular factorial subring and a p-basis of a polynomial ring in two variables in characteristic p = 3
2. Kan Kaneko:
   On units of a family of cubic number fields
3. Silvestru Sever Dragomir:
   Inequalities for Power Series in Banach Algebras
4. Yoshiomi Nakazuru and Takashi Seo:
   Single and multiple comparison procedures for partial covariance matrices of two treatment groups in clinical trials

NUMBER 2

Preface: FIFTIETH ANNIVERSARY ISSUE
Contents: Contents of Volume 50, Number 2, 2014

1. Nakao Hayashi and Pavel I. Naumkin:
   On the generalized reduced Ostrovsky equation
2. Naoyuki Koike:
   Research of submanifolds in symmetric spaces by using the complexification and the infinite dimensional geometry
3. Kouji Tahata and Sadao Tomizawa:
   Symmetry and asymmetry models and decompositions of models for contingency tables
4. Yasushi Narushima and Hiroshi Yabe:
   A survey of sufficient descent conjugate gradient methods for unconstrained optimization
5. Yukihiko Nakata, Yoichi Enatsu, Hisashi Inaba, Toshikazu Kuniya, Yoshiaki Muroya, and Yasuhiro Takeuchi:
   Stability of epidemic models with waning immunity
6. Takahiro Nishiyama, Masashi Hyodo and Takashi Seo:
   Recent developments of multivariate multiple comparisons among mean vectors
7. Naoyuki Koike:
   The complexifications of pseudo-Riemannian manifolds and anti-Kaehler geometry
8. Kouji Tahata, Kouji Yamamoto and Sadao Tomizawa:
   Wald-type measure of departure from symmetry for square contingency tables with nominal categories
9. Asanao Shimokawa, Yohei Kawasaki and Etsuo Miyaoka:
   An approach for constructing survival tree based on combination of covariates
10. Kazuyuki Hasegawa:
    Twistor holomorphic affine surfaces and projective invariants
11. Iwona Mejza, Stanislaw Mejza and Shinji Kuriki:
    Two-factor experiment with split units constructed by a BIBRC
12. Jun-ichi Inoguchi:
    Harmonic maps in almost contact geometry
13. Keiichi Kato and Shingo Ito:
    Singularities for solutions to time dependent Schrödinger equations with sub-quadratic potential
14. Masahito Ohta:
    Instability of solitary waves for nonlinear Schrödinger equations of derivative type
15. Kenta Ozeki:
    A shorter proof of Thomassen’s theorem on Tutte paths in plane graphs
16. Jun Fujisawa and Katsuhiro Ota:
    Maximal cycles in graphs of large girth
17. Takahiko Furuya and Takao Hayami:
    Hochschild cohomology ring of a cluster-tilted algebra of type D4
18. Nobumichi Shutoh:
    Tail quantile approximations for hybrid lognormal distribution
19. Kazuyuki Koizumi, Takuma Sumikawa and Tatjana Pavlenko:
    Measures of multivariate skewness and kurtosis in high-dimensional framework