[1] Chen H.: 
An answer to a conjecture on the countable products of $k$-spaces. Proc. Amer. Math. Soc. 123 (1995), 583-587. 
MR 1273481 | 
Zbl 0813.54021[2] Engelking R.: 
General Topology, Heldermann Verlag, Berlin, 1988.  
MR 1039321[4] Gruenhage G.: 
A note on the product of Fréchet spaces. Topology Proc. 3 (1978), 109-115. 
MR 0540482[5] Gruenhage G., Michael E., Tanaka Y.: 
Spaces determined by point-countable covers. Pacific J. Math. 113 (1984), 303-332. 
MR 0749538 | 
Zbl 0561.54016[6] Kannan V.: 
Every compact $T_5$ sequential space is Fréchet. Fund. Math. 107 (1988), 85-90. 
MR 0584661[7] Lin S., Tanaka Y.: 
Point-countable $k$-networks, closed maps, and related results. Topology Appl. 59 (1994), 79-86. 
MR 1293119 | 
Zbl 0817.54025[8] Michael E.A.: 
A note on closed maps and compact sets. Israel J. Math. 2 (1964), 173-176. 
MR 0177396 | 
Zbl 0136.19303[9] Michael E.A.: 
Bi-quotient maps and cartesian products of quotient maps. Ann. Inst. Fourier, Grenoble 18 (1968), 287-302. 
MR 0244964 | 
Zbl 0175.19704[11] Michael E., Olson R.C., Siwiec F.: 
$A$-spaces and countably bi-quotient maps. Dissertationes Math. 133 (1976), 4-43. 
MR 0418023 | 
Zbl 0338.54006[12] Morita K.: 
Some results on $M$-spaces. Colloquia Math. Soc. János Bolyai 8 (1972), 489-503. 
MR 0365462[13] Mynard F.: 
Strongly sequential spaces. Comment. Math. Univ. Carolin. 41 (2000), 143-153. 
MR 1756935 | 
Zbl 1037.54504[14] Mynard F.: 
More on strongly sequential spaces. Comment. Math. Univ. Carolin. 43 (2002), 525-530. 
MR 1920528 | 
Zbl 1090.54006[15] Noble N.: 
Products with closed projections, II. Trans. Amer. Math. Soc. 160 (1971), 169-183. 
MR 0283749 | 
Zbl 0233.54004[16] Nogura T.: 
The product of $\langle {\alpha_i} \rangle$-spaces. Topology Appl. 21 (1985), 251-259. 
MR 0812643[17] Nogura T.: 
Products of Fréchet spaces. General Topology and its Relations to Modern Analysis and Algebra VI, Proc. Sixth Prague Top. Symposium 1986, Heldermann Verlag, Berlin, 1988, pp.371-378. 
MR 0952623 | 
Zbl 0654.54019[18] Olson R.C.: 
Bi-quotient maps, countably bi-sequential spaces, and related topics. General Topology Appl. 4 (1974), 1-28. 
MR 0365463 | 
Zbl 0278.54008[19] Simon P.: 
A compact Fréchet space whose square is not Fréchet. Comment. Math. Univ. Carolin. 21 (1980), 749-753. 
MR 0597764 | 
Zbl 0466.54022[20] Simon P.: 
A hedgehog in the product. Acta Univ. Carolin. Math. Phys. 39 (1998), 147-153. 
MR 1696588[21] Siwiec F.: 
Sequence-covering and countably bi-quotient mappings. General Topology Appl. 1 (1971), 143-154. 
MR 0288737 | 
Zbl 0218.54016[24] Tanaka Y.: 
On closedness of $C$- and $C^*$-embeddings. Pacific J. Math. 68 (1977), 283-292. 
MR 0448299 | 
Zbl 0374.54010[25] Tanaka Y.: 
Some necessary conditions for products of $k$-spaces. Bull. Tokyo Gakugei Univ. Ser. IV, 30 (1978), 1-16. 
MR 0512222 | 
Zbl 0427.54016[27] Tanaka Y.: 
Products of $k$-spaces, and questions. Comment. Math. Univ. Carolin. 41 (2000), 143-153. 
MR 2026168[28] Tanaka Y.: 
Theory of $k$-networks II. Questions Answers Gen. Topology 19 (2001), 27-46. 
MR 1815344 | 
Zbl 0970.54023[29] Tanaka Y.: 
Determining covers and dominating covers. Questions Answers Gen. Topology 24 (2006), 123-141. 
MR 2269658 | 
Zbl 1111.54024